Kroon, D., Norris, R.D., and Klaus, A. (Eds.) Proceedings of the Ocean Drilling Program, Scientific Results Volume 171B
9. APTIAN THROUGH EOCENE MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT (LEG 171B), FLORIDA CONTINENTAL MARGIN1
James G. Ogg2 and Leon Bardot3
ABSTRACT
The full suite of magnetic polarity chrons from Subchron M″-2r″ (early Albian) through Chron C13r (latest Eocene) were resolved at one or more Ocean Drilling Program sites on the Blake Nose salient of the Florida continental margin. These sediments preserve diverse assem- blages of calcareous and siliceous microfossils; therefore, the composite 1Ogg, J.G., and Bardot, L., 2001. suite provides a reference section for high-resolution correlation of bio- Aptian through Eocene magnetostratigraphic correlation of stratigraphic datums to magnetic polarity chrons of the Late Cretaceous the Blake Nose Transect (Leg 171B), and Paleogene. Relative condensation or absence of polarity zones at Florida continental margin. In Kroon, different sites along the transect enhance the recognition and dating of D., Norris, R.D., and Klaus, A. (Eds.), depositional sequences and unconformities within the margin succes- Proc. ODP, Sci. Results, 171B, 1–58 sion. A stable paleolatitude of ~25°N was maintained from the late Ap- [Online]. Available from World Wide Web:
Sampling and Demagnetization
Approximately 1100 discrete minicores were extracted from the “A” holes at the five sites, the “C” hole extension of Site 1050, and the Cre- taceous/Paleogene boundary interval in the “C” hole of Site 1049. Sam- pling density averaged about two minicores per core section. Soft sediment samples were taken using oriented plastic cylinders (~10 cm3) followed by extrusion, trimming, and air drying. Indurated sediment minicores were drilled into the cut face of the working half of the core with a water-cooled nonmagnetic drill bit attached to a standard drill press. Minicore orientations are perpendicular to the axis of the core, and therefore horizontal relative to bedding strata. Some of the ad- vanced hydraulic piston cores (denoted by the suffix “H” in the core name) had attempts at downhole orientation relative to magnetic north using a tensor tool mounted on the core barrel, but these at- tempts were generally unreliable. Therefore, declinations of magnetiza- tion of the minicores are random, although stability or progressive rotation of the magnetic declinations during demagnetization can be used to identify characteristic magnetic polarity. Shipboard pass-through cryogenic magnetometer measurements were made at ~5-cm intervals on all cores from all holes using alternat- ing-field demagnetization at 10–20 mT. Even though these shipboard measurements were commonly distorted by coring recovery artifacts, such as biscuiting slurry, and were generally inadequate to remove mag- netic overprints, the main polarity patterns were often remarkably in- dicative of the detailed demagnetization results from the suites of minicores. Paleomagnetic analyses of the suites of minicores were performed at the University of Oxford and at the University of Michigan. Progressive thermal demagnetization was tailored to each facies based on pilot studies of each lithology from each site, but it generally consisted of 30°C increments from ~100°–360°C, with continuation to higher ther- mal steps for the more stable samples. Bulk susceptibility was generally monitored after every second thermal demagnetization step <300°C, and after every higher temperature step to monitor changes in mag- netic mineralogy and onset of viscous magnetization associated with formation of new magnetic phases. Magnetic directions were measured on a cryogenic magnetometer isolated from the Earth’s magnetic field in a shielded room (Michigan) or with Helmholtz coils (Oxford). The practical limit on resolution of the natural remanence of the minicores was ~5 × 10–6 A/m, and duplicate measurements were taken whenever the intensity was <2 × 10–5 A/m.
Common Magnetic Overprints and Demagnetization Behavior
Even though magnetic characteristics varied greatly among the vari- ous lithologies, it is possible to summarize the typical behavior. Initial natural remanent magnetization (NRM) directions are dominated by a downward inclination, which is presumed to be the combined second- ary overprints of normal polarity oriented parallel with the present di- pole field and a drilling-induced remanence. The drilling-induced J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 4 overprint has always plagued Deep Sea Drilling Project (DSDP) and ODP paleomagnetic studies and is characterized by a downward (high posi- tive inclination) and radially inward orientation (e.g., the series of in- vestigative studies made by the paleomagnetists during Leg 154, as summarized in successive site chapters in Curry, Shackleton, Richter, et al., 1995). This radial-inward overprint is exhibited as an apparent pref- erential declination toward 0° (“north”); therefore, relatively few sam- ples displayed initial NRM declinations between 100° and 260°, in contrast to the expected random distribution. Secondary overprints were largely removed upon heating above 180°C, and dual polarity was generally observed from 200° through 360°C. Upon heating >360°C, most samples displayed a rapid increase in susceptibility accompanied by viscous magnetization. Despite per- forming the thermal demagnetization and measurements within a shielded room, the onset of spurious viscous magnetizations generally rendered continued demagnetization to be fruitless. A minority of sam- ples, generally from intervals with a more condensed accumulation or a reddish colored facies, could be demagnetized at temperatures >360°C without displaying viscous magnetizations (Fig. F1). F1. Vector plots of thermal demag- The general magnetic behavior during thermal demagnetization sug- netization, characteristic direc- gests that a common carrier of characteristic magnetization (generally tions, and polarity ratings, Hole in the 200°–400°C range) is magnetite. The surge in susceptibility above 1049A, p. 19.
Sample 171B-1049A-9H-3, 120-122 cm; 66.10 mbsf Sample 171B-1049A-13H-2, 121-123 cm; 98.41 mbsf Sample 171B-1049A-15X-CC, 3-5 cm; 105.83 mbsf Lower Eocene Paleocene Lower Paleocene Greenish white to vanilla-colored soft chalk Grayish brown clayey siliceous limestone Grayish brown clayey siliceous limestone 360°C observed in many samples is probably due to a combination of Characteristic direction (150°-300°C): Characteristic direction (180°-480°C): Characteristic direction (210°-480°C): 39.6° inclination, 225.4° declination -41.1° inclination, 23.6° declination 36.6° inclination, 151.8° declination 8.1° mean angular deviation (MAD) 2.4° mean angular deviation (MAD) 2.7° mean angular deviation (MAD) Polarity rating = NP (only 4 vectors incorporated) Polarity rating = R Polarity rating = N dehydration of iron-rich clays, oxidation of iron sulfides, and minor Chron assignment = C22n Chron assignment = C26r Chron assignment = C28n AB C 270°, Up 270°, Up 270°, Up 100°C 180° 0° 140°C 140°C contributions from the alteration of iron minerals in the organic-rich NRM
NRM claystone by organic combustion. 180° 0° 180° 0° NRM NRM
90°, Down 90°, Down 90°, Down Characteristic Directions, Polarity Ratings, 1 scale division = 0.5 mA/m 1 scale division = 0.5 mA/m 1 scale division = 2 mA/m and Paleolatitudes
Polarity interpretation of the 180°–350°C magnetization component was generally obvious from the attained characteristic inclinations and relative rotation of declinations. Most samples either attained a direc- tion that remained stable through multiple heating steps as the inten- sity of magnetization decreased (i.e., univectoral decay to the origin on the vector diagrams) or displayed development of a quasi-stable direc- tion and intensity prior to the onset of erratic magnetization at higher temperatures. However, for a few samples, a stable end-point character- istic direction was not achieved prior to the onset of viscous magnetiza- tion and it was necessary to deduce polarity from their progressive demagnetization trends. Characteristic magnetization directions and associated variances were computed for each sample by applying a least-squares three-dimensional line fit (procedure of Kirschvink, 1980) to sets of vectors displaying removal of a single component in equal- area and vector plots of the progressive demagnetization. Each characteristic direction was assigned a polarity rating based upon the individual demagnetization behavior: (1) well-defined N or R directions computed from at least five vectors having a high degree of linearity and a univectorial trend toward the origin (e.g., Figs. F1B, F1C), (2) less precise NP or RP directions computed from three to four vectors having a high degree of linearity and a univectorial trend to- ward the origin (e.g., Fig. F1A) or from at least five vectors displaying a “noisy” linear trend, (3) NPP or RPP samples that did not achieve ade- quate cleaning during demagnetization and were omitted from paleo- latitude computations, and (4) samples with uncertain N?? or R?? or indeterminate INT polarity that were generally not used to define polar- J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 5 ity zones. To reduce the bias of a single observer, selection and rating of characteristic magnetization vectors and associated polarity interpreta- tions were done independently by two people and the more conserva- tive assignment was generally used; however, the minor differences in assigning ratings did not affect a common identification of polarity zones. Of the 1075 samples, 291 were rated N or R and 224 were NP or RP. Assignment of polarity chrons of the standard magnetic polarity time scale to these stratigraphic polarity zones required biostratigraphic control, as will be summarized below for each site. In many cases, de- limitation of polarity zone boundaries was further constrained by the high-resolution shipboard measurements with the long-core cryogenic magnetometer; however, the quality of this shipboard data was com- monly compromised by a difficulty in removing secondary overprints through alternating-field demagnetization and a high degree of noise from drilling artifacts, as summarized in the Leg 171B Initial Reports site chapters. Assignment of polarity chrons utilizes the pattern of normal- and re- versed-polarity zones within each interval and the reference scales for biomagnetochronology of nannofossil and planktonic foraminifer da- tums compiled for the Paleogene (Berggren et al., 1995) and the Late Cretaceous (Erba et al., 1995) as compiled in the “Biostratigraphy” sec- tion of the “Explanatory Notes” chapter of the Leg 171B Initial Reports volume (Shipboard Scientific Party, 1998a) (Fig. F2). The biostratigra- F2. Assignment of magnetic polar- phy for each hole has undergone progressive refinement, and the col- ity chrons to magnetostratigra- umns for each site in this study are based upon the compilations in the phy, p. 20.
Leg 171B Initial Reports volume (Norris, Kroon, Klaus, et al., 1998) with Eocene through Campanian time scale AGE PERIOD POLARITY AGE Planktonic Calcareous (Ma) EPOCH Stage CHRON (Ma) foraminifers nannoplankton
NP23 CP18 P19 C12 modifications to the Campanian–Maastrichtian interval presented by OLIGOCENE CP17 c P18 NP22 CP16 b C13 33.7 P17 NP21 a P16 C15 NP19-20 35 l Priabonian CP15 C16 NP18 Brian Huber (foraminifers) and Jean Self-Trail (calcareous nannofossils) P15 37.0 C17 NP17 b Bartonian P14 C18 40 P13 CP14 at the 1998 postcruise conference. In turn, the magnetostratigraphy has 41.3 NP16 a C19 P12 m
c c C20 P11 45 Lutetian NP15 b b indicated inconsistencies both with some portions of the reference CP13 a
EOCENE a P10 C21 b b NP14 CP12 49.0 a a P9 C22 NP13 CP11 50 PALEOGENE compilations of biomagnetochronology and with the assigned bio- P8 Ypresian C23 P7 NP12 CP10 c b NP11 b P6 CP9 C24 P6 b a NP10 a stratigraphy at different sites. This iterative procedure of improving bio- 55.0 P5 a b 55 P5 NP9 CP8 a c CP7 Thanetian C25 b NP8 NP7 CP6 P4 57.9 a NP6 CP5 l C26 NP5 CP4 stratigraphic calibrations and possible reinterpretation of the Selandian b P3 60 a 61.0 P2 NP4 CP3 C27 c
ee Danian P1 NP3 CP2 C28 b
PALEOCENE α magnetostratigraphy and reassignment of polarity chrons is a common P & P0 NP2 CP1 b C29 65.0 a NP1 a 65 Micula b Abathomphalus prinsii mayaroensis, Gansserina gansseri Nephrolithus CC25 a C30 frequens
Abathomphalus Micula mayaroensis murus c Maastrichtian Lithraphidites
quadratus CC26 b process before developing a robust biomagnetic chronology. Racemiquembelina fructicosa, Reinhardtites a C31 Contusotruncana levis contusa 70 CC24 Quadrum 71.3 trifidum Tranolithus Gansserina phacelosus C32 gansseri Globotruncana CC23 Paleolatitudes for successive time intervals at each site were derived aegyptica Aspidolithus Globotruncanella parcus (B. parca) havanensis Lithastrinus grillii 75 Globotruncanita calcarata Eiffellithus CC22 eximius Quadrum trifidum CC21 Quadrum Campanian sissinghii from mean inclinations computed using the procedure of Kono (1980a, Ceratolithoides CC20 aculeus Globotruncana ventricosa C33 Bukryaster CC19 CRETACEOUS hayi 80 Marthasterites furcatus Ceratolithoides ventricosa Aspidolithus CC18 1980b) for calculating statistics of inclination-only data from unori- parcus constricta Globotruncanita Aspidolithus elevata parcus parcus 83.5 Dicarinella CC17 asymetrica & Calculites ented vertical drill cores. This method uses the mean and standard devi- Santonian C34 D. concavata obscurus C. floralis CC16 ations of the sines of the inclinations to compensate for the circular Gaussian (Fisherian) distribution of paleomagnetic vectors. A simple mean of the inclinations gives unrealistic importance to the lower val- ues. Kono’s nonlinear simultaneous equations relating the true mean inclination and the circular dispersion parameter, K, to the statistics of the sines of the inclination data were solved using Newton’s method to converge on the solutions. Samples having characteristic directions rated NP or RP were given one-half weight. To test the validity of Kono’s procedure, we submitted previously analyzed sets of data from out- crops; the resulting mean inclination is within 0.1° of the inclination given by statistics on such directional data (procedure modified from Fisher, 1953). McFadden and Reid (1982) independently developed a different computational procedure to calculate mean inclinations from azimuthally unoriented paleomagnetic data, but the similarity of re- sults suggests that it has the same mathematical basis as Kono’s proce- dure. J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 6
The magnetostratigraphy, paleolatitudes, and any significant depar- tures from the general magnetic behavior at each site are summarized in the following sections from the most seaward (Site 1049) to the most landward (Site 1053).
MAGNETOSTRATIGRAPHY AND POLARITY CHRON ASSIGNMENTS
Site 1049
Site 1049 penetrated mid-Cretaceous alternations of calcareous clay and chalk, overlain by a relatively compact succession of Maastrichtian through middle Eocene nannofossil chalk. Paleomagnetic minicores were obtained from Hole 1049A, except the Cretaceous/Tertiary (K/T) boundary interval was sampled in Hole 1049C. Albian Subchron M″-2r″ is resolved in two holes, and the condensed uppermost Cretaceous and Paleogene strata yielded an incomplete record of polarity Chrons C33n through C19n.
Aptian/Albian Boundary Interval and Albian Magnetic Polarity Subchron M″-2r″
The Aptian through lower Albian sediments are dominated by the normal polarity of Chron C34n (Cretaceous Long Normal Polarity Chron). Shipboard indications of two thin reversed-polarity zones within this interval were verified by the minicores (Fig. F3; Table T1). A F3. Magnetostratigraphy and po- reversed-polarity interval in the basal Albian within Sections 171B- larity chron assignments, Site 1049A-20X-1 and 20X-2, 171B-1049B-11X-2, and 171B-1049C-12X-2 is 1049, p. 22. immediately above a 0.5-m-thick interval of distinctive black shale. Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination Age Core Recovery Calc. nanno. Depth (mbsf) Plank. foram. ° ° ° ° ° Graphic Unit -90 -45 0 45 90 R Int N interpretation This organic-rich level has been correlated to Atlantic-Tethys oceanic 2X Mn CN14a Pl. 3H Mn C19n CP14a P12 C19r 20 4H C20n anoxic event 1b (OAE 1b) and the equivalent Jacobi event in southeast- I CP13c 5H Mn CP13b P11 C20r
40 6H CP12b m Eocene ern France, which is a candidate for defining the Aptian/Albian stage 7H 8H CP12a C21r? Mn P9-10 9H CP11 top C22r C22n (shipboard) 60 10X C23n boundary (J. Erbacher, pers. comm., 1998). The overlying reversed- CP10 P7-8 11X II
e Eocene C24n 12X CP9b P6-7 80 polarity zone coincides with an anomalous yellowish and greenish CP6 P4-5 C26n? 13H C26r? 14X CP3 P3a C27r? 15X CP2 P1c Hole 1049A core depths shifted upward by 13.0 m by Hole 1049A core depths shifted upward C28n 100 staining on the original sediments. This suggests that the apparent re- early late CP1b P1b C28r? 16X CP1a P0-1a C29n Paleocene C29r III K/T 17X CC26b A. 120 versed-polarity magnetization is a diagenetic artifact of post-Albian iron mayar. C30n C30r? Not consistent 18X CC24 between holes
G.fa. Maast. C32n C33n 19X M"-2"r CC8a e 140 H. Diagenetic "reversed" mobilization induced by redox contrasts near this organic-rich interval. Albian 20X gorb. polarity near black shale IV -T. prim. 21X CC7 C34n The second reversed-polarity zone occurs 8.5 m above the base of the 160 22X l Aptian OAE 1b organic-rich shale (paleomagnetic minicore at Section 171B- Lithology legend Nannofossil Nannofossil Diatom Siliceous Manganese ooze Clay 1049A-19X-2, 103 cm, and shipboard magnetometer data at interval ooze chalk ooze nodule or crust 171B-1049C-11X-3, 10–35 cm). This thin reversed-polarity band within the upper Ticinella primula planktonic foraminifer zone of the lower Al- T1. Characteristic directions, po- bian appears to be coeval with brief reversed-polarity episodes reported larity ratings, and polarity assign- from near the boundary of the T. primula and Biticinella breggiensis ments, Holes 1049A and 1049C, planktonic foraminifer zones at other DSDP sites (e.g., Leg 27 by Jar- p. 29. rard, 1974; Leg 40 by Keating and Helsley, 1978) and in Italian sections (VandenBerg and Wonders, 1980; Tarduno et al., 1992). Polarity Chron M0r is at the base of the Aptian, and the DSDP Leg 40 Scientific Party (Ryan et al., 1978) proposed a M″-1r″ through M″-3r″ nomenclature for the series of brief reversed-polarity subchrons within the Aptian– Albian. Further documentation is required to verify whether the re- ported M″-2r″ event or events represent true reversed-polarity episodes (J.E.T. Channell, pers. comm., 1999). Based on the Leg 40 ages for these episodes, we assign the thin (25 cm) reversed-polarity subzone of Site J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 7
1049 as the earliest subchron of the M″-2r″ suite. Albian sedimentation at Site 1049 was truncated shortly above this M″-2r″ polarity subzone. The upper Aptian through lower Albian sediments display oscillation in geochemistry and reddish to greenish white color. Spectra of these variations yield ratios consistent with the suite of Milankovitch orbital- climate cycles of 413 and 100 k.y. (eccentricity), 54 and 40 k.y. (obli- quity), and 23 and 19 k.y. (precession) (Ogg et al., 1999). The implied sedimentation rate for the lower Albian derived from these Milanko- vitch cycles is ~100 k.y./m. This rate implies that reversed-polarity Sub- chron M″-2r″ commenced ~0.75 m.y. after the initiation of OAE 1b. Polarity subzone M″-2r″ spans only ~25 cm in Hole 1049C; therefore, this polarity subchron had a duration of ~25 k.y.
K/T Boundary Interval and Uppermost Cretaceous
All three holes at Site 1049 recovered a spectacular record of the end- Cretaceous impact ejecta. Shipboard pass-through cryogenic measure- ments indicate that the greenish layer of spherules at the K/T boundary is reversed polarity, consistent with the placement of this event within polarity Chron C29r. This boundary layer is the only interval with an unambiguous polarity chron assignment. The assignment of polarity chrons within the underlying uppermost Cretaceous is compromised by discontinuous strata, hiatuses, poor pa- leomagnetic characteristics, and synsedimentary slumping and/or drill- ing-induced disruption. The Maastrichtian and upper Campanian chalk recovered from the three holes at Site 1049, even though these holes are spaced only 10 m apart, yielded different biostratigraphic successions and relative thicknesses of biostratigraphic zones (Shipboard Scientific Party, 1998b; B. Huber and J. Self-Trail, pers. comm., 1998). We ob- tained independent Maastrichtian magnetostratigraphies from mini- core sampling in Holes 1049A and 1049C. A reversed-polarity zone in Core 171B-1049A-18X is not present in the equivalent depth interval (relative to the K/T spherule horizon) within Hole 1049C. Biostrati- graphic constraints suggest that this discontinuous reversed-polarity zone is polarity Chron C30r. There is no indication that mid-Maastrich- tian polarity Chrons C31n–C31r are present, and the biostratigraphy as- sociated with the underlying normal-polarity zone indicates a probable juxtaposition of C33n of the late Campanian and C32n of the early Maastrichtian.
Paleocene
Paleocene polarity Chrons C29n through C26n appear to be repre- sented by alternating normal- and reversed-polarity zones in Hole 1049A, although resolution of the thicknesses and relative complete- ness of these zones is precluded by the patchy recovery of the interbed- ded chalk-chert-ooze facies. As a result, the assignment of the polarity chrons is based entirely on the biostratigraphic ages. Latest Danian po- larity Chron C27n was not resolved, and the Paleocene/Eocene bound- ary interval spanning polarity Chrons C25r–C25n–C24r is either condensed or absent at this site.
Lower and Middle Eocene
Biostratigraphy indicates that the apparent pair of normal- and re- versed-polarity intervals spanning the lower Eocene (Cores 171-1049A- J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 8
12X through 5H) is the concatenation of polarity Chrons C24n–C23n– C22n and C21r–C20r, respectively. The record of polarity Chron C23r may be absent because of a recovery gap. Measurements with the ship- board pass-through magnetometer suggest that a sliver of polarity Zone C21r of basal Lutetian (lowermost middle Eocene) may be present be- low the lower Lutetian hiatus spanning the majority of Chron C21r and all of Chron C21n. The upper Lutetian portion of the middle Eocene is represented by polarity Chrons C20r, C20n, C19r, and C19n. In contrast to the under- lying Paleocene and lower Eocene, this interval is relatively expanded and appears to be continuous sedimentation.
Site 1050
Site 1050 penetrated upper Albian claystone and lower Cenomanian chalk, overlain by a highly condensed Turonian through Coniacian and a nearly continual succession of upper Campanian through middle Eocene clayey to siliceous chalk and ooze. Paleomagnetic minicores were obtained from the Albian through Danian (lower Paleocene) in Hole 1050C and from the upper Paleocene through middle Eocene in Hole 1050A. The magnetostratigraphy resolved a nearly complete succession of polarity Chrons C33n (late Campanian) through C19n (mid-middle Eocene).
Albian–Cenomanian and Upper Cretaceous
The suite of cores spanning the upper Albian claystone, lower Cen- omanian chalk, and condensed Turonian–Coniacian yielded normal polarity, consistent with their deposition during the Cretaceous Long Normal Polarity Chron C34n (Fig. F4; Table T2). F4. Magnetostratigraphy and po- A series of polarity zones is present within the upper Campanian larity chron assignments, Site through Maastrichtian. However, the assignment of polarity chrons is 1050, p. 23.
Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination ° ° ° ° interpretation
Unit -90 -45 45 90 Depth Recovery Core Int (mbsf)
Age R N Graphic Calc. nanno. Plank. foram. slightly ambiguous because of the presence of two major coring gaps 1X C19n
2X C19r, with 20 IB overprints? 3X CP14a P12
4X 40 5X C20n
6X 60 (nonrecovery in Cores 171B-1050C-14R and 12R), a synsedimentary 7X
8X
80 9X P11 10X IC CP13b
100 11X C20r slumped interval in the uppermost Campanian that has probably reset 12X 120 13X
14X
CP13a 140 15X CP12b upper C21n 16X P8-P10
17X lower C22n 160 C22r the magnetization, possible magnetic overprints, and the lack of a well- 18X C23n
19X CP11a 180 P7 C23r 20X C24n 21X C24n.1r? P6b 200 CP9b 22X ?
23X P6a 220 early Eocene middle Eocene 24X calibrated biomagnetic reference time scale for this time period. The IC CP9a C24r 25X
240 26X P5 27X CP8b
28X C25n 260 29X P4 CP6 C25r 30X CP5 280 C26n placement of the Campanian/Maastrichtian boundary indicates that 31X 32X P3b 33X CP4
300 34X C26r 35X II late Paleocene 36X 320 1R P3a CP3 2R III 340 Cores 171B-1050C-16R through 18R are probably polarity Chron C32n, 3R C27n
4R
360 5R C27r
6R IVA II CP2 380 7R P1c C28n III 8R C28r early Paleocene including its reversed-polarity Subchron C32n.1r. The Maastrichtian CP1b P1b C29n 9R 400 CP1a -Pα C29r 10R 11R C30n 420 12R Alt.#1 Alt.#2 CC26b IVB C30r 13R lower C31n C30n 440 14R A. mayaroensis C30r 15R CC25 C31n biostratigraphy and magnetic polarity pattern above Chron C32n can R. fruct. C31r 16R C31r 460 Maastrichtian C32n.1n 17R ? C32n.1r 18R CC24 - G. gansseri IVA G. falsostuarti C32n.2n? 480 Remagnetized 19R CC21 G.cal.- slump -CC23 G.vert. Camp. C33n? 20R CC19 Con., V -CC11 500 Turon. be interpreted in at least two ways; therefore, dual alternatives span- 21R 22R R. 520 23R VIA cushmanii C34n
24R CC9b+9c 540 "Cretaceous 25R R. Long 26R greenhorn. e Cenomanian 560 Normal 27R ning Chrons C31r through C30n are displayed in the polarity column R. Polarity 28R appen. Chron" 580 29R VIB CC9a 30R R. late Albian 600 31R ticinensis
Lithology legend (Fig. F4). Nannofossil Nannofossil Diatom Siliceous Manganese Clay ooze chalk ooze ooze nodule or crust
Paleocene T2. Characteristic directions, po- A complete polarity succession of Chrons C29r through C24r spans a larity ratings, and polarity assign- 200-m interval in upper Hole 1050C and lower Hole 1050A (Fig. F4). ments, Holes 1050A and 1050C, The relative widths of these polarity zones are nearly identical to the p. 33. relative duration of chrons in the marine magnetic anomaly model (Cande and Kent, 1995), implying a fairly constant sedimentation rate. The only exception is that polarity Chron C27n is slightly expanded relative to the oceanic model (Fig. F2), a pattern also noted in nearby Hole 1051A and in Hole 1001A in the Caribbean Sea (V. Louvel and B. J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 9
Galbrun, unpubl. data), suggesting that the relative durations in the oceanic model require slight modification. Sediments deposited during polarity Chrons C27r and C27n display oscillations of color and relative carbonate content. This combined po- larity Chron C27r–C27n spans 35–36 obliquity cycles in both the high- resolution geochemical stratigraphy and the natural gamma downhole logs (Röhl et al., in press). This yields a cycle-tuned duration of 1.45 m.y. for polarity Chron C27r–C27n. Similar cycle-duration analyses are underway for polarity Chrons C26r through C25n (U. Röhl and J. Ogg, unpubl. data). The cyclostratigraphy of the Paleocene/Eocene boundary interval within polarity Chron C24r implies an anomalous release of carbon at the associated isotopic excursion (Norris and Röhl, 1999).
Lower and Middle Eocene
Early Eocene polarity Chrons C24r through earliest C22n are as- signed from the pattern of polarity zones in association with the bio- stratigraphy (Fig. F4). Within the interval corresponding to reversed- polarity Chrons C22r and upper C24r are narrow subzones of normal polarity that may represent either pervasive normal-polarity overprints at particular horizons or normal-polarity subchrons not present in the reference magnetic anomaly scale (Fig. F2). It is interesting that similar levels of normal polarity or uncertain magnetization occur within these two chrons at Site 1051 (Fig. F5). F5. Magnetostratigraphy and po- The lower/middle Eocene boundary (Ypresian/Lutetian stage bound- larity chron assignments, Hole ary) is a hardground at 153 mbsf (Section 171B-1050A-16X-7, 42 cm) 1051A, p. 24.
Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination Age Core Recovery Calc. nanno. (mbsf) Plank. foram. Graphic Unit ° ° ° ° ° interpretation Depth -90 -45 0 45 90 R Int N CP15 C16r? 2H IA Also in shipboard that coincides with the omission of calcareous nannofossil Zone CP12a data of Hole 1051B
20 3H C17n 4H C17n.1r? P14 40 5H IB C17n.2r? 6H
7H 60 CP14b C17r (e.g., fig. 8 in Shipboard Scientific Party, 1998c). This hardground has 8H C18n
9H 80 P13
10H
11H 100 IC C18r 12H
13H 120 juxtaposed sediments deposited during the earliest part of polarity 14H
15H C19n 140 16H C19r 17X P12 160 18X CP14a
19X
180 Chron C22n and the later portion of Chron C21n, implying a hiatus of 20X
21X
200 22X middle Eocene C20n
23X
220 24X
25X
26X ~1.5 m.y. at this site. 240 CP13c 27X ID
260 28X ?
29X P11
280 30X
31X
CP13b C20r Middle Eocene siliceous chalks at most sites were not as generous in 32X 300
33X
34X 320
35X
36X 340
37X CP13a yielding their paleomagnetic secrets as lower Eocene and older sedi- 38X 360 39X C21n P8-P10 CP12b 40X
380 41X II CP12a C21r
42X C22n 400 43X C22r CP11 ments. A rapid loss of magnetic intensity upon thermal demagnetiza- 44X C23n
420 P7 45X C23r
46X CP10 440 C24n 47X
48X CP9b Either an N in P6b chron C24r, or 460 49X a persistent 50X normal-polarity early Eocene overprint tion, coupled with inadequate removal of secondary overprints prior to 51X III
480 52X C24r
53X CP9a
P6a ?
500 54X
55X
520 56X P5
loss of signal, resulted in the majority of paleomagnetic samples being CP8 57X C25n
540 58X C25r CP7
59X P4 CP5 60X 560 61X C26n CP4 62X P3b
63X late Paleocene unsuitable for use in determining paleolatitudes. Prolonged contact 580 IV C26r 64X A P3a 65X 600 lower C26r? 66X
CP3 ? 67X 620 68X IV P2 C27n 69X B 70X 71X C27r? with oxidized bottom waters after cessation of sedimentation in the late 640 72X
73X P1c e Paleocene
Lithology legend Nannofossil Nannofossil Manganese Clay Eocene caused a secondary yellowish discoloration and associated mag- ooze chalk nodule or crust netic overprinting of the upper 40 m in each hole (lithologic Unit IIB). Therefore, we are confident in assigning polarity Chrons C20r and C20n, but resolution of Chrons C19r and C19n is difficult (Fig. F4).
Site 1051
Site 1051 penetrated a thick succession of lower Paleocene through middle Eocene siliceous chalk to ooze. The magnetic properties and stratigraphy are similar to the coeval facies at Site 1050. The magneto- stratigraphy from minicores in Hole 1051A, supplemented by ship- board data from Hole 1051B, resolved the complete succession of polarity Chrons C27n (Danian stage of the early Paleocene) through C16r (base of late Eocene). J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 10
Paleocene
In contrast to Site 1050, the gray chalks in the lower portion of the Paleocene (Danian and Selandian stages) at Site 1051 displayed rela- tively poor magnetic properties. The characteristic magnetization of the lower 80 m of Hole 1051A is dominated by poor-quality results of ap- parent normal polarity, and therefore are rated “NPP” (Fig. F5; Table T3). However, the biostratigraphy indicates that this upper Danian– T3. Characteristic directions, po- lower Selandian interval should be dominated by reversed polarity of larity ratings, and polarity assign- Chrons C27r and 26r, with only a relatively narrow normal-polarity in- ments, Hole 1051A, p. 43. terval associated with Chron C26n (Fig. F2). Therefore, we tentatively consider the “NPP”-dominated intervals to represent incomplete re- moval of a normal-polarity overprint from a primary reversed-polarity original magnetization. Chron C27n is assigned only to the relatively high-rated normal-polarity (“N” and “NP”) characteristic directions from ~620 to 630 mbsf within planktonic foraminifer Zone P2, and the adjacent sediments have indeterminate polarity. The upper Paleocene (Thanetian stage) yielded a good-quality mag- netostratigraphy pattern that is assigned to polarity Chrons C26n, C25r, C25n, and early C24r (Fig. F5).
Lower and Middle Eocene
The early Eocene (Ypresian) pattern of polarity Chrons C24r, C24n, C23r, C23n, C22r, and early C22n is reflected without significant dis- tortion in the magnetostratigraphy. The only exceptions are an interval of anomalous normal-polarity overprint or subchron in the upper por- tion of the polarity zone assigned to Chron C24r (~460–475 mbsf) and a band of indeterminate polarity within the zone assigned to Chron C23r. These levels seem to be coeval with similar features in the magne- tostratigraphy of Site 1050. The Ypresian/Lutetian stage boundary interval (contact between the lower Eocene and middle Eocene) is a biostratigraphic hiatus at all sites of Leg 171B. As in Site 1050, the majority of polarity Chron C22n of the latest Ypresian and the early portion of Chron C21r of earliest Lutetian are absent but the sediments overlying this hiatus at both holes of Site 1051 record the latest portion of C21r as a narrow band of reversed po- larity (Fig. F5) (Shipboard Scientific Party, 1998d). The middle Eocene Lutetian and Bartonian stages are relatively ex- panded, and the magnetostratigraphy pattern displays an excellent record of polarity Chrons C21n through C17n, including indications of the brief Subchrons C17n.1r and C17n.2r within polarity Chron C17n (Fig. F5). Within this succession, the apparent thickness of the polarity zone assigned to mid-Bartonian Chron C18n is shortened relative to the reference magnetic polarity time scale of Cande and Kent (1995). Shipboard measurements of cores from the upper portion of Hole 1051B in the pass-through cryogenic magnetometer suggest a reversed- polarity zone at the base of the upper Eocene, and the associated calcar- eous nannofossil Zone CP15 indicates a possible assignment to polarity Chron C16r.
Site 1052
Site 1052 penetrated upper Albian and lower Cenomanian silty clay- stone overlain by Maastrichtian through lower Paleocene clayey chalk to calcareous claystone, followed by a hiatus to middle and upper J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 11
Eocene siliceous chalk and ooze. Paleomagnetic minicores were ob- tained from Albian through Danian (lower Paleocene) in Hole 1052E and uppermost lower Paleocene through upper Eocene in Hole 1052A. The suites from these two holes duplicate the uppermost portion of the Paleocene. Above the Albian–Cenomanian normal polarity of Chron C34n, the magnetostratigraphy resolved a complete succession of polarity chrons C31r (early Maastrichtian) through C26r (basal Selandian of late Paleo- cene) followed by the series from C19r (latest Lutetian of middle Eocene) through C16n (early Priabonian of late Eocene).
Albian–Cenomanian and Maastrichtian
The upper Albian and lower Cenomanian consists entirely of normal polarity, consistent with deposition during the Cretaceous Long Nor- mal Polarity Chron C34n (Fig. F6; Table T4). Cenomanian sedimenta- F6. Magnetostratigraphy and po- tion is truncated, and deposition resumed with Maastrichtian clayey larity chron assignments, Site chalk of reversed polarity. 1052, p. 25.
Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination Age Core Recovery Calc. nanno. Depth (mbsf) Plank. foram. Graphic Unit -90°-45° 0° 45° 90° R Int N interpretation 1X IA Core 2X polarity is from shipboard 2X C15r? long-core magnetometer IB 3X C16n 20 C16n.1r? Assignment of polarity Chrons C31r through C29r to the Maastrich- 4X
5X 40 C16r
6X P15a CP15a
7X 60 8X C17n
9X C17n.1r 80 IC tian magnetostratigraphy is based upon the distinctive polarity pattern 10X C17n.2r? 11X C17r 100 12X
13X P14 CP14b C18n 120 14X
15X
16X
140 17X middle Eocene late Eocene C18r
IIA P13 Minor and the biostratigraphy (Fig. F6). The upper limit of the polarity zone 18X hiatus CP14a 19X C19n 160 P12 C19r Hiatus 20X mid- C26r CP3 21X C27n 180 5R IIB C27r 6R P3a
200 7R assigned to Chron C31n is at a synsedimentary slump feature, and a 8R ? 220 9R CP3 10R C27r 11R 240 P2 12R
III eary Paleocene 13R 260
14R P1c slump within the uppermost portion of the zone assigned to Chron 15R C28n 280
16R CP2 P1b 17R α
300 P C29n
18R CP1b Polarity from C29r shipboard pass-through 19R magnetometer 320 20R
CC26b C30n
21R C31r coincides with a nannofossil subzonal boundary. However, the rel- 340 22R C30r? slump
IVA CC26a
23R A. mayaroensis 360 24R C31n CC25c
25R 380 26R
CC25b R. 27R slump
fructicosa 400 atively expanded biomagnetic stratigraphy of the Maastrichtian inter- 28R
29R CC25a 420 30R Maastrichtian IVB 31R C31r
440 32R CC24
33R
- G. gansseri G. falsostuarti val provides a useful reference site for calibration of biochronology to 460 34R 35R CC23?
480 36R
37R VA CC10 500 38R R. green.
39R
40R e Cenomanian 520 CC9b polarity chrons. 41R
42R 540 43R R. appenninica C34n 44R 560
45R VB "Cretaceous 46R Long 580 47R Normal
48R Polarity 600 Chron" 49R CC9a
50R late Albian 620 51R
52R
53R R. ticinensis 640 54R
55R 660 Lower Paleocene 56R VC
57R
680 58R CC8b
Lithology legend Nannofossil Nannofossil Diatom Siliceous Limestone ooze chalk ooze ooze Manganese nodule Siltstone Sandstone Clay or crust The K/T boundary interval displays reversed polarity in shipboard pass-through magnetometer measurements, consistent with assign- ment to polarity Chron C29r (Shipboard Scientific Party, 1998e). An ex- T4. Characteristic directions, po- tended interval of normal polarity extends for ~55 m above the K/T larity ratings, and polarity assign- boundary. Biostratigraphic constraints indicate that this normal-polar- ments, Holes 1052A and 1052E, ity zone represents the concatenation of polarity Chron C29n with p. 49. Chron C28n. Reversed-polarity Chron C28r, which coincides approxi- mately with the boundary between foraminifer Zone P1c and P2, is ab- sent. Resolution of the upper Danian (late polarity Chron C27r and early Chron C27n) is compromised by low recovery and poor magnetic be- havior. The top of the Paleocene succession is a narrow band of reversed polarity that probably represents the earliest part of polarity Chron C26r of earliest Selandian. Nearly the entire late Paleocene is absent.
Middle and Upper Eocene
Sedimentation resumes above the Eocene–Paleocene unconformity with a narrow band of reversed polarity. The biostratigraphy, coupled with the polarity pattern of the succeeding middle Eocene, indicates that this band represents the latest portion of polarity Chron C19r of latest Lutetian. A hardground at 150 mbsf (Section 171B-1052A-18X-4, 10 cm) seems to coincide with the P12/P13 foraminifer zonal boundary (approxi- mately coinciding with the Lutetian/Bartonian stage boundary) and with the contact between polarity zones assigned to Chrons C19n and J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 12
C18r. The relative widths of the polarity pattern with respect to Chrons C19n–C18r–C18n in the reference magnetic polarity time scale (Fig. F2) indicates a comparative shortening of Chron C18r. Therefore, we infer this hardground to be a temporary cessation of sedimentation during the early portion of polarity Chron C18r. The full suite of polarity Chrons C18n through C16n, including the brief subchrons, is present within the complete sediment recovery of the upper portion of Hole 1052A. Shipboard measurements of cores on the pass-through cryogenic magnetometer suggest that the uppermost sediments were deposited during polarity Chron C15r of the mid-Pria- bonian stage, but this requires verification by progressive demagnetiza- tion of minicores.
Site 1053 Middle Eocene
Site 1053 penetrated upper Bartonian (uppermost middle Eocene) through upper Eocene siliceous chalk to ooze. The magnetostratigraphy from minicores in Hole 1053A was consistent with the shipboard cryo- genic measurements of cores from Hole 1053B (Shipboard Scientific Party, 1998f). However, the sediment facies were weakly magnetized and generally did not yield reliable magnetic directions upon heating to 300°C and higher; therefore, we cannot ascertain whether the charac- teristic polarity at the relatively low-temperature demagnetization steps (typically 180°–270°C) represent adequate removal of later overprints. A long interval of normal polarity is bounded by 30-m-thick zones of re- versed polarity in the upper Bartonian (lower 30 m of Hole 1050A) and in the uppermost Eocene (upper 30 m of each hole) (Fig. F7; Table T5). F7. Magnetostratigraphy and po- The long normal-polarity zone is interrupted by two to three narrow re- larity chron assignments, Hole versed-polarity excursions. The dominance by normal polarity is consis- 1053A, p. 26. tent with the late Bartonian through early Priabonian succession of Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination
Age ° ° ° ° ° Depth Recovery Core Calc. nanno. (mbsf) Plank. foram. Graphic Unit -90 -45 0 45 90 R Int N interpretation
1H Alt#1 Alt#2 C18n through C16n, with relatively brief reversed-polarity chrons and IB 2H C13r C15r 20 subchrons (Fig. F2). The biostratigraphy, especially the boundary be- 3H
4H P16 upper 40 C15n 5H C16n
tween foraminifer Zones P14 and P15, indicates that the relatively thick CP15b 6H C15r reduced by C16n.1r 60 winnowing? 7H lower reversed-polarity zone at the base of Hole 1053A is probably polarity C16n C16n 8H IC C16r is absent? Chron C17r. 80 9H 10H
100 11H
However, assignment of polarity chrons to the overlying general pat- late Eocene 12H C17n?
120 13H P15 tern is hindered by the broad biostratigraphic zones (e.g., only two fora- CP15a 14H
15H 140 minifer zones and a single calcareous nannofossil zone). This 16X 17X C17n
18X biostratigraphy does not provide adequate constraints to evaluate either 160 ID 19X C17r 20X
180 CP14b the continuity of sedimentation or whether the weakly magnetized P14 m Eoc.
Lithology legend chalk had yielded its original polarity chronology. Nannofossil Nannofossil Diatom ooze chalk ooze Therefore, two of several alternative polarity assignments are dis- played for the upper half of Hole 1053A (Fig. F7). The first alternative assumes that the relatively thick reversed-polarity zone at the top of T5. Characteristic directions, po- Hole 1053A is polarity Chron C13r of the latest Eocene. Under this sce- larity ratings, and polarity assign- nario, polarity Chrons C15r and C16r are either absent, condensed, or ments, Hole 1053A, p. 55. not resolved by the demagnetization procedures. The second alterna- tive assigns the thick uppermost reversed-polarity zone to Chron C15r of mid-Priabonian. Applying relative durations results in an assignment of Subchron C16n.1r to the narrow reversed-polarity excursion at 55 mbsf and a similar absence of polarity Chron C16r. It may be possible to improve resolution and validity of the magnetostratigraphy by de- tailed demagnetization of samples from Hole 1053B, but the low-resolu- J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 13 tion biostratigraphic control may preclude an unambiguous assignment of polarity chrons.
PALEOLATITUDES
Models of Cretaceous plate motion have commonly assumed that North America remained stationary throughout the entire Cretaceous period, and rapid spurts of continental drift occurred in the earliest and latest Cretaceous (e.g., Irving et al., 1993). According to the generalized Cretaceous compilation (Irving et al., 1993), the sites drilled during Leg 171B, which are presently at a latitude of 30°N, have a predicted mid- Cretaceous (Hauterivian to Santonian) paleolatitude of 30°N, a rapid Late Cretaceous northward drift to a Campanian–Maastrichtian posi- tion at 40°N, followed by a return southward to reach their present po- sition in the late Tertiary. However, the array of paleolatitudes from Aptian through Eocene from the five sites indicates that a remarkably stable paleolatitude of about 25°N was maintained during this time span (Table T6; Fig. F8). T6. Paleolatitude of Leg 171B sites, All sites and all sediment facies yield quite similar values. There is no p. 58. evidence of any significant paleolatitude shifts during this interval. In- deed, the apparent motion during the late Tertiary merely consisted of a minor northward drift (<5°) rather than the southward motion from F8. Paleolatitude history of the current models of North American polar wander. Blake Nose margin, p. 27. This array of Leg 171B results, which are the most detailed continu- 50 ous paleolatitude records of any location on the North American plate, 40 suggests that the current Cretaceous through early Tertiary polar wan-
N) 30 der path for North America may contain artifacts of poor age con- °
20 straints on magnetically suitable sediments on the North American ( Paleolatitude craton and inadequate statistical processing of relevant paleomagnetic 10 results. The “stable Cretaceous pole” of North America has been signifi-
0 35 55 75 95 115 cantly mispositioned southward by nearly 10° latitude. Age (Ma) A reanalysis of the North American paleomagnetic database (C. Mac- Niocaill, L. Bardot, and J. Ogg, unpubl. data) is consistent with our paleolatitude path from the Blake Nose margin transect.
IMPLICATIONS OF MAGNETOSTRATIGRAPHIC CORRELATIONS
Cretaceous
Cretaceous strata were penetrated at only three of the five sites and indicate shifting depocenters and progressive condensation toward the seaward margin (Fig. F9). F9. Correlation of magnetostratig- raphy across the Blake Nose Mid-Cretaceous (Polarity Chron C34n) Transect, p. 28.
Magnetostratigraphy of Leg 171 Transect Reference Site 1052 Site 1053 Site 1051 Site 1050 Site 1049 Time Scale Composite of Hole A Hole A Composite of Composite of Holes A & E Biostratigraphy Magnetostratigraphy Holes A & C Holes A & C Polarity rating Polarity chron Age Calc. nanno. Depth (mbsf) Plank. foram. R Int N interpretation CP15 C16r? Also in shipboard The thick package of upper Albian through lower Cenomanian clay- data of Hole 1051B 20 C17n C17n.1r? 40 P14 C17n.2r? C17n
60 CP14b C17r top C18n WE80 P13
100 C18r
120 C19n C19n and silt-rich sediments present at Sites 1052 and 1050 completely pinch 140 Biostratigraphy Magnetostratigraphy Polarity rating Polarity chron C19r Age Calc. nanno. Depth (mbsf) Plank. foram. interpretation
R Int N P12 160 Eocene through Campanian Alt#1 Alt#2 CP14a C13r C15r AGE POLARITY AGE Planktonic Calcareous 20 180 (Ma) PERIOD EPOCH Stage CHRON (Ma) foraminifers nannoplankton
P16 upper 200 NP23 CP18 Biostratigraphy 40 C15n C16n middle Eocene C20n P19 Magnetostratigraphy Polarity rating Polarity chron CP15b C1 CP17 c C15r Biostratigraphy Age Calc. nanno. (mbsf) Plank. foram. OLIGOCENE Depth R Int N interpretation reduced by C16n.1r Magnetostratigraphy P18 NP22 60 winnowing? 220 b Polarity from lower Polarity rating Polarity chron CP16 C15r? shipboard NP21 long-core C16n C16n Depth (mbsf) Int interpretation
Age R N a magnetometer Calc. nanno. C1 33.7 P17 Plank. foram. C16n C16r is absent? P16 20 C16n.1r? 80 240 CP13c C19n C1 NP19-20 35 Priabonian CP15 C19r, with C1 20 overprints? CP14a NP18 40 ? P12 P15 C16r 100 260 P15a 37.0 late Eocene CP15a out at seaward Site 1049, where the lower Albian is directly overlain by C1 C17n? P11 40 C20n NP17 b 60 120 280
C17n P15 Bartonian P14 CP15a C1 60 C17n.1r CP13b C20r 40 P13 CP14 80 140 300 41.3 C17n.2r? NP16 a C1 P12 C17n 80 C17r Biostratigraphy
m 100 320 Magnetostratigraphy P11
160 CP13b Polarity rating Polarity chron middle Eocene C20r Age
c Calc. nanno. Depth (mbsf) Plank. foram. c P14 100 R Int N interpretation CP14b C18n C17r C2 P11 120 340 180 CP14b CN14a Pl. m Eoc. b CP13a 45 Lutetian NP15 b CP13 P14 C19n CP14a 120 P12 C19r 20 C20n
a middle Eocene late Eocene EOCENE a 140 C18r 360 C21n CP13c
P10 P8-P10 P13 Minor CP13a CP13b C2 CP12b b b hiatus 140 P11 C20r
40 m Eocene CP14a C19n CP12b CP12b NP14 CP12 160 P12 380 upper C21n C19r CP12a C21r P8-P10 a a Hiatus CP12a C21r? 49.0 mid- C26r P9-10 P9 CP3 lower C22n CP11 C22n top C22r C2 NP13 CP11 C27n C22n 160 (shipboard) 50 PALEOGENE P8 C22r 60 C23n the Maastrichtian. The upper Aptian and lower Albian record at Site 180 400 CP10 P7-8 C22r C23n C27r CP11 C2 CP11a P7 NP12 CP10 P7 e e Eocene P3a C22n 180 CP9b P6-7 C24n Ypresian C23n C23r 80 CP6 P4-5 C26n? 200 420 P7 C26r? c b NP11 b C24n CP3 P3a C27r? P6 ? C23r C24n.1r? CP9 P6b CP2 P1c Hole 1049A core depths shifted upwards by 13.0 m CP10 200 CP9b C28n C2 P6 b a NP10 a 100
P1b early late 220 440 C24n ? CP1b C28r? CP3 55.0 P5 b CP1a P0-1a Paleocene C29n 55 a P5 NP9 C29r CP8 P6a K/T early Eocene
a CP9b C27r Either an N in CC26b A. P6b 220 c chron C24r, or 120 CP9a mayar. C30n NP8 CP7 240 460 a persistent C24r C30r? C2 b normal-polarity CC24 Not consistent
Thanetian P2 between holes early Eocene G.fa. Maast. NP7 CP6 overprint C32n C33n P4 M"-2"r e NP6 CP5 early Paleocene 240 CC8a 57.9 a P5 H. ll 140 Diagenetic "reversed" C24r Albian
260 480 CP8b gorb. polarity near black shale NP5 CP4 C24r -T.
C2 P1c b C25n prim. Selandian CP9a CC7 C34n P6a ? base 260 P3 C28n 160 60 a P4 280 500 CP6 C25r 61.0 P2 NP4 CP3 l Aptian CP2 CP5 C2 c 280 C26n P1b α
P C29n 300 520 P5 P3b CP1b Polarity from
e NP3 CP2 P1 C29r shipboard CP4
Danian CP8 C2 b pass-through C25n magnetometer 1049, albeit relatively compact, provides a cycle-tuned time scale for PALEOCENE α 300 P & P0 NP2 CP1 b a a 320 540 C25r C26r
NP1 CP7 C2 65.0 late Paleocene CC26b C30n 65 Micula b P4 Abathomphalus prinsii CP5 mayaroensis, C26n 320 Gansserina CC25 C3 gansseri Nephrolithus a 340 560 C26n P3a
frequens C30r? CP3 slump CP4 Abathomphalus Micula CC26a
c A. mayaroensis 340 mayaroensis murus P3b C27n Maastrichtian Lithraphidites 360 580 late Paleocene C26r quadratus CC26 b Racemiquembelina Reinhardtites a C31n
fructicosa, CC25c C3 Contusotruncana levis 70 contusa P3a 360 C27r CC24 380 600 lower C26r? Quadrum C27n
trifidum CC25b 71.3 R. slump CP3 ? CP2 380 P1c
Tranolithus fructicosa C28n Gansserina phacelosus gansseri 400 620 C3 P2 Globotruncana CC23 C27n C28r aegyptica early Paleocene CP1b P1b C29n Aspidolithus 400 CC25a CP1a -Pα C29r Globotruncanella parcus (B. parca) 640 C27r? havanensis 420 Maastrichtian
Lithastrinus P1c
grillii e Paleocene 75 Globotruncanita C30n calcarata Eiffellithus CC22 C31r eximius 420 Alt.#1 Alt.#2 Quadrum CC26b this interval and a duplicate record of lower Albian polarity Subchron trifidum CC21 440 C30r C29r Quadrum lower sissinghii CC24 C30n Campanian CC20 C31n Ceratolithoides - G. gansseri
G. falsostuarti 440
aculeus A. mayaroensis 460 C30r Globotruncana CC25 C31r C31n ventricosa R. fruct. C3 Bukryaster CC19
CRETACEOUS C31r CC23? hayi 460 Maastrichtian 80 Marthasterites C32n.1n furcatus 480 ? Ceratolithoides C32n.1r
ventricosa CC24 - G. gansseri CC10 G. falsostuarti C32n.2n? Aspidolithus CC18 480 Remagnetized
parcus constricta R. green. 500 C31r base CC21 G.cal.- slump Globotruncanita Aspidolithus -CC23 G.vert. elevata parcus parcus Camp. C33n? CC19 Con., 83.5 Dicarinella CC17 -CC11 asymetrica & Calculites 500 Turon. D. concavata C. floralis e Cenomanian C3 obscurus CC9b Santonian CC16 520 R. 520 cushmanii 540 C34n
″ ″ R. appenninica
C34n CC9b+9c 540 "Cretaceous R. 560 Long greenhorn.
"Cretaceous eCenomanian M -2r . Normal Long 560
R. Polarity 580 Normal appen. Chron" Polarity 580 600 Chron" CC9a R. CC9a late Albian
600 ticinensis 620 late Albian R. ticinensis
640
660
680 CC8b J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 14
Late Campanian through Maastrichtian (Polarity Chrons C33n to C29r)
The basal sediments overlying the major Late Cretaceous unconfor- mity are progressively older toward the seaward margin: the early por- tion of Maastrichtian polarity Chron C31r is identified at landward Site 1052 and a sliver of mid-Campanian polarity Chron C33n is identified at Sites 1050 and 1049. Latest Campanian polarity Chron C32r was not recognized at any site. The Campanian/Maastrichtian boundary inter- val (polarity Chron C32n and its reversed-polarity subchron) is resolved only at Site 1050. The Maastrichtian succession, which is relatively complete and ex- panded at Site 1052, is heavily distorted by condensation or hiatuses in the seaward sites. Early Maastrichtian polarity Chrons C31r and C31n are equivalent to nearly 120 m at Site 1052, but span only between 10 and 30 m at Site 1050, and are a depositional hiatus at Site 1049. Polar- ity zones corresponding to late Maastrichtian polarity Chron C30n and early Chron C29r also thin seaward but are partially preserved at all three sites. In contrast to the general tendency of seaward condensa- tion, only Site 1049 has preserved an intact record of the K/T boundary impact event within polarity Chron C29r.
Paleocene
Paleocene strata were penetrated at four sites. The Maastrichtian pat- tern of seaward condensation was probably maintained, but apparently the upper Paleocene record at landward Site 1050 was later removed by middle Eocene erosion (Fig. F9).
Danian Stage (Polarity Chrons C29r through C27n)
The thickness of the Danian progressively thins from Site 1052 (135 m) through Sites 1051 and 1050 (~70 m) to Site 1049 (~25 m). There was a major mid-Danian episode of condensation or hiatus across the margin, as indicated by the absence or relative thinness of polarity Chrons C29n and C28r at all sites. Cycle stratigraphy through polarity Chrons C27r and C27n indicates that these chrons encompass 1.45 m.y. and that the total duration of the Danian stage should be short- ened by ~0.35 m.y. to span from 65.5 to 61.85 Ma (Röhl et al., 2001).
Selandian Stage (Polarity Chron C26r)
The Selandian stage is approximately equivalent to the long reversed- polarity Chron C26r (Fig. F2) (Berggren et al., 1995). This interval is only significant at Site 1050 in the outer portion of the margin, where it spans ~50 m. At both the most landward (Site 1052) and most seaward (Site 1049) sites, only a thin sliver (<5 m) of the Selandian may be present. At landward Site 1052, this remaining Selandian sediment is directly overlain by the mid-Lutetian of the middle Eocene, and we pos- tulate that this major unconformity was created by an episode of mid- dle Eocene erosion that stripped away a significant thickness of upper Paleocene sediments in the landward portion of this margin. The re- duced thickness of polarity Chron C26r at Site 1049 seems to be associ- ated with a general pronounced condensation of the upper Paleocene through lowermost Eocene interval, rather than a specific unconfor- mity. J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 15
Thanetian Stage (Polarity Chrons C26n to mid-C24r)
The pattern of relative thickness of the Thanetian strata across the margin mirrors the underlying Selandian. There is a progressive seaward thinning from Site 1051 through Site 1049.
Eocene
Sediments of the Ypresian (lower Eocene) and Lutetian (lower middle Eocene) display a progressive seaward thinning at Sites 1051, 1050, and 1049 but are an erosional hiatus at landward Site 1052 (Fig. F9). Barto- nian (upper middle Eocene) and younger sediments are not preserved at seaward Sites 1050 and 1049. Cessation of deposition occurred at Site 1052 during the middle Priabonian (upper Eocene) and at the most landward Site 1053 near the Eocene/Oligocene boundary.
Ypresian Stage (Polarity Chrons mid-C24r through C22n)
All polarity chrons of the Ypresian are present at Sites 1051 (span- ning 125 m) and 1050 (90 m). The Ypresian at seaward Site 1049 is par- tially condensed (35 m), with omission of late Ypresian polarity Chron C22r.
Lutetian Stage (Polarity Chrons C21r through C19n)
The basal Lutetian is represented by a hiatus across the margin, and there are indications of erosion of the uppermost Ypresian and differ- ences of timing of resumption of sedimentation at the various sites. The termination of sedimentation below the hiatus is during polarity Chron C26r at Site 1052, early Chron C22n at Site 1051, earliest Chron C22n at Site 1050, and possibly the beginning of Chron C21r at Site 1049. Preservation of sedimentation resumed during polarity Chron C19r at Site 1052, latest C21r at Site 1051, late C21n at Site 1050, and early C20r at Site 1049. This irregular pattern and magnitude of the deposi- tional hiatus suggests an early Lutetian (lasting until the latest Lutetian at landward Site 1052) episode of bottom-current erosion and preven- tion of sediment accumulation across the margin. This episode may have been an initial pulse of the western boundary current that would later terminate sedimentation in late Eocene. Above this basal Lutetian hiatus, the thickness pattern of individual polarity zones (e.g., polarity zones corresponding to Chrons C20r and C20n) display the typical seaward thinning. Middle Lutetian polarity Chrons C20r and C20n encompass 170 m at Site 1051, 110 m at Site 1050, and only 30 m at Site 1049. The end of the Lutetian (end of polarity Chron C19n) is the termina- tion of preserved sedimentation at seaward Sites 1050 and 1049. This end Lutetian event is also reflected as a minor hardground in the cored sediments of Site 1052.
Bartonian Stage (Polarity Chrons C19r to C17n)
The package of Bartonian sedimentation at Sites 1052 and 1051 ap- pears to record all polarity chrons and the major polarity subchrons (e.g., C17n.1r and C17n.2r). Site 1053 did not yield an unambiguous magnetostratigraphy in this interval. The total thickness of the Barto- nian is nearly identical (120 m) at both Site 1052 and 1051, although J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 16 individual polarity zones indicate slight differences in accumulation patterns during this interval.
Priabonian Stage (Polarity Chrons C17n through C13r)
There is a progressive landward termination of sedimentation through the Priabonian, with the end of accumulation occurring dur- ing polarity Chron C16r at Site 1051, latest Chron C16n or early Chron C15r at Site 1052, and either latest Chron C15r or C13r at Site 1053. No Oligocene or younger sediments have accumulated on this margin swept by the western boundary current system.
SUMMARY
The array of Leg 171B sites yielded a detailed magnetostratigraphy of the Aptian/Albian boundary interval (including polarity Subchron M″- 2r″) and the Cenomanian through Eocene. All polarity chrons from C31r (early Maastrichtian) through C15r (latest Eocene) are present as relatively thick polarity zones at one or more sites. The precise place- ment of polarity reversals within individual Milankovitch orbital-sedi- ment cycles should be possible with further focused sampling. The current array provides a reference suite for enhanced biostratigraphic calibration and general astronomical tuning of the Maastrichtian through Eocene magnetic polarity time scale and oceanic spreading rates.
ACKNOWLEDGMENTS
John Foster, a former graduate student at Purdue University, played a key role in the detailed demagnetization and analysis of the hundreds of paleomagnetic minicores. We thank Buffy McClelland (University of Oxford) and Rob Van der Voo (University of Michigan) for providing generous access to their laboratories for extended intervals. This project was supported by grants from USSAC and NERC. Our shipboard col- leagues, especially the paleontology teams and the ODP curatorial staff, tolerated our extensive minicore sampling and eagerly worked with us on the biomagnetostratigraphic framework. Jim Channell performed a thorough review of the manuscript, and the ODP editorial office fine- tuned the presentation. J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 17 REFERENCES
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North Atlantic Paleogene and Cretaceous Palaeoceanography. Geol. Soc. Spec. Publ. London, 183:163–184. Ryan, W.B.F., Bolli, H.M., Foss, G.N., Natland, J.H., Hottman, W.E., and Foresman, J.B., 1978. Objectives, principle results, operations, and explanatory notes of Leg 40, South Atlantic. In Bolli, H.M., Ryan, W.B.F., et al., Init. Repts. DSDP, 40: Wash- ington (U.S. Govt. Printing Office), 5–26. Shipboard Scientific Party, 1998a. Explanatory notes. In Norris, R.D., Kroon, D., Klaus, A., et al., Proc. ODP, Init. Repts., 171B: College Station, TX (Ocean Drilling Program), 11–44. ————, 1998b. Site 1049. In Norris, R.D., Kroon, D., Klaus, A., et al., Proc. ODP, Init. Repts., 171B: College Station, TX (Ocean Drilling Program), 47–91. ————, 1998c. Site 1050. In Norris, R.D., Kroon, D., Klaus, A., et al., Proc. ODP, Init. Repts., 171B: College Station, TX (Ocean Drilling Program), 93–169. ————, 1998d. Site 1051. In Norris, R.D., Kroon, D., Klaus, A., et al., Proc. ODP, Init. Repts., 171B: College Station, TX (Ocean Drilling Program), 171–239. ————, 1998e. Site 1052. In Norris, R.D., Kroon, D., Klaus, A., et al., Proc. ODP, Init. Repts., 171B: College Station, TX (Ocean Drilling Program), 241–319. ————, 1998f. Site 1053. In Norris, R.D., Kroon, D., Klaus, A., et al., Proc. ODP, Init. Repts., 171B: College Station, TX (Ocean Drilling Program), 321–348. Tarduno, J.A., Lowrie, W., Sliter, W.V., Bralower, T.J., and Heller, F., 1992. Reversed polarity characteristic magnetizations in the Albian Contessa section, Umbrian Apennines, Italy: implications for the existence of a mid-Cretaceous mixed polar- ity interval. J. Geophys. Res., 97:241–271. VandenBerg, J., and Wonders, A.A.H., 1980. Paleomagnetism of late Mesozoic pelagic limestones from the Southern Alps. J. Geophys. Res., 85:3623–3627. J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 19 ° , Up om Hole ° ° , Down r ° 0 90 270 NRM to compute the compute to ht vectors with with a ht vectors d C): ° projected onto a hor-
-480 ° declination ° C28n C ° C heating steps between steps between C heating 180 ° N 140 inclination, 151.8 1 scale division = 2 mA/m ° mean angular deviation (MAD) mean angular deviation NRM ° ° C, then 30 C, then ° C; C; characteristic direction is assigned an NP 180 Polarity rating = rating Polarity Chron assignment = 2.7 Sample 171B-1049A-15X-CC, 3-5 cm; 105.83 mbsf 3-5 cm; Sample 171B-1049A-15X-CC, Paleocene Lower siliceous limestone clayey brown Grayish Characteristic direction (210 36.6 ° ° 0 and 650 ° NRM C): ° -480 ° C ° declination ° 140 Paleocene siliceous limestone at at limestone Paleocene 140 siliceous C26r B. C heating steps between 100 ° R 1 scale division = 0.5 mA/m inclination, 23.6 ° mean angular deviation (MAD) mean angular deviation ° , Up ° , Down 41.1 ° - 90 270 Polarity rating = rating Polarity Chron assignment = 2.4
Sample 171B-1049A-13H-2, 121-123 cm; 98.41 mbsf cm; Sample 171B-1049A-13H-2, 121-123 Paleocene siliceous limestone clayey brown Grayish Characteristic direction (180 ° 180 Eocene chalkat50 A. C; characteristic direction is assigned an R polarity rating because it is computed from eig from computed is because it rating polarity R an assigned is direction C; characteristic ° , Up ° ° , Down 0 ° Paleocene siliceous limestone with the same demagnetization as in B; characteristic direction N an is assigned characteristic in B; as demagnetization same with the siliceous limestone Paleocene 90 C. 270 , and 480 , and ° C): ° -300 , 400 ° ° declination ° C22n (only 4 vectors incorporated) (only 4 vectors C ° NP NRM 100 Representativevector plots of thermaldemagnetization, characteristic directions, and polarityratingsPaleogeneforsamples f C, then 350 C, then ° 1 scale division = 0.5 mA/m inclination, 225.4 ° ° mean angular deviation (MAD) mean angular deviation ° 180 AB C Chron assignment = 8.1 = rating Polarity Sample 171B-1049A-9H-3, 120-122 cm; 66.10 mbsf cm; Sample 171B-1049A-9H-3, 120-122 Eocene Lower soft chalk Greenish white to vanilla-colored Characteristic direction (150 39.6 and 300 deviation. angular low mean deviation. angular mean low with a vectors seven computed from because it is rating polarity Figure F1. F1. Figure core and of the is working half of the face the cut into line to perpendicular a (solid relative is squares) Declination 1049A. use of vectors is the succession The bold line value and magnitude. actual is the squares) (open inclination and plane, izontal vectors. four only direction for characteristic each sample. from computed is it because rating polarity J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 20
Figure F2. Late Cretaceous and Paleogene biochronology and the magnetic polarity time scale used as the reference standard for assigning magnetic polarity chrons to magnetostratigraphy of Leg 171 sites. The Pa- leogene portion is modified after Berggren et al. (1995), and the Late Cretaceous section is modified from Erba et al. (1995) and Shipboard Scientific Party (1998a). In the Polarity column, white bands = reversed- polarity chrons and black bands = normal-polarity chrons. (Figure shown on next page.) J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 21
Figure F2 (continued).
Eocene through Campanian time scale
AGE PERIOD POLARITY AGE Planktonic Calcareous (Ma) EPOCH Stage CHRON (Ma) foraminifers nannoplankton
NP23 CP18 P19 C12 OLIGOCENE CP17 c P18 NP22 CP16 b C13 33.7 P17 NP21 a P16 C15 NP19-20 35 l Priabonian CP15 C16 NP18 37.0 P15 C17 NP17 b Bartonian P14 C18 40 P13 CP14 41.3 NP16 a C19 P12 m
c c C20 P11 b 45 Lutetian NP15 b CP13
a
EOCENE a P10 C21 b b NP14 CP12 49.0 a a P9 C22 NP13 CP11 50 PALEOGENE P8 Ypresian C23 P7 NP12 CP10 c b NP11 b P6 CP9 C24 P6 b a NP10 a 55.0 P5 55 a P5 b NP9 CP8 a c CP7 Thanetian C25 b NP8 NP7 CP6 P4 57.9 a NP6 CP5 l C26 NP5 CP4 b Selandian P3 60 a 61.0 P2 NP4 CP3 C27 c
ee Danian P1 NP3 CP2 C28 b
PALEOCENE α P & P0 NP2 CP1 b C29 65.0 a NP1 a 65 Micula b Abathomphalus prinsii mayaroensis, Gansserina gansseri Nephrolithus CC25 a C30 frequens
Abathomphalus Micula mayaroensis murus c Maastrichtian Lithraphidites
quadratus CC26 b Racemiquembelina fructicosa, Reinhardtites a C31 Contusotruncana levis contusa 70 CC24 Quadrum 71.3 trifidum Tranolithus Gansserina phacelosus C32 gansseri Globotruncana CC23 aegyptica Aspidolithus Globotruncanella parcus (B. parca) havanensis Lithastrinus grillii 75 Globotruncanita calcarata Eiffellithus CC22 eximius Quadrum trifidum CC21 Quadrum Campanian sissinghii Ceratolithoides CC20 aculeus Globotruncana ventricosa C33 Bukryaster CC19 CRETACEOUS hayi 80 Marthasterites furcatus Ceratolithoides ventricosa Aspidolithus parcus constricta CC18 Globotruncanita Aspidolithus elevata parcus parcus 83.5 Dicarinella CC17 asymetrica & Calculites Santonian C34 D. concavata obscurus C. floralis CC16 J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 22
Figure F3. Magnetostratigraphy and polarity chron assignments for Site 1049. The generalized lithostratig- raphy and biostratigraphy are from Shipboard Scientific Party (1998b), with Maastrichtian biostratigraphy and associated polarity assignments modified by J. Self-Train and B. Huber (pers. comm., 1998). The polar- ity rating system (see “Characteristic Directions, Polarity Rating, and Paleolatitudes,” p. 4, in “Proce- dures and General Magnetic Properties”) from left to right is R, RP, RPP (at left vertical dashed line), R??, INT, N??, NPP (at right vertical dashed line), NP, and N. Magnetic stratigraphy of a suite of minicores span- ning the Maastrichtian–lower Paleocene interval at Hole 1049C is shown as open circles, but magnetic po- larity chron assignments for the lower Maastrichtian and uppermost Campanian are for the Hole 1049A magnetostratigraphy (solid circles). Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination Age Core Recovery Calc. nanno. Depth (mbsf) Plank. foram. ° ° ° ° ° Graphic Unit -90 -45 0 45 90 R Int N interpretation 2X Mn CN14a Pl. 3H Mn C19n CP14a P12 C19r 20 4H C20n I CP13c 5H Mn CP13b P11 C20r
40 6H CP12b m Eocene
7H 8H CP12a C21r? Mn P9-10 9H CP11 top C22r C22n (shipboard) 60 10X C23n CP10 P7-8 11X II
e Eocene C24n 12X CP9b P6-7 80 CP6 C26n? 13H P4-5 C26r? 14X CP3 P3a C27r? 15X CP2 P1c Hole 1049A core depths shifted upward by 13.0 m by Hole 1049A core depths shifted upward C28n 100 CP1b P1b early late C28r? 16X CP1a P0-1a C29n Paleocene C29r III K/T 17X CC26b A. 120 mayar. C30n C30r? Not consistent 18X CC24 between holes
G.fa. Maast. C32n C33n 19X M"-2"r CC8a e 140 H. Diagenetic "reversed" Albian 20X gorb. polarity near black shale IV -T. prim. 21X CC7 C34n 160 22X l Aptian
Lithology legend Nannofossil Nannofossil Diatom Siliceous Manganese Clay ooze chalk ooze ooze nodule or crust J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 23
Figure F4. Magnetostratigraphy and polarity chron assignments for the composite succession of Site 1050 (composed from Holes 1050A and 1050C). The generalized lithostratigraphy and biostratigraphy are from Shipboard Scientific Party (1998c), with Campanian–Maastrichtian biostratigraphy and associated polarity assignments modified by J. Self-Train and B. Huber (pers. comm., 1998). The polarity rating system (see “Characteristic Directions, Polarity Rating, and Paleolatitudes,” p. 4, in “Procedures and General Mag- netic Properties”) from left to right is R, RP, RPP (at left vertical dashed line), R??, INT, N??, NPP (at right vertical dashed line), NP, and N. (This figure is also available in an oversized format.) Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination ° ° ° ° interpretation
Unit -90 -45 45 90 Depth Core Recovery Int (mbsf)
Age R N Graphic Calc. nanno. Plank. foram.
1X C19n
2X C19r, with 20 IB overprints? 3X CP14a P12
4X 40 5X C20n
6X 60 7X
8X
80 9X P11 10X IC CP13b
100 11X C20r
12X
120 13X
14X
CP13a 140 15X CP12b upper C21n 16X P8-P10
17X lower C22n 160 C22r 18X C23n
19X CP11a 180 P7 C23r 20X C24n 21X C24n.1r? P6b 200 CP9b 22X ?
23X P6a 220 early Eocene middle Eocene 24X IC CP9a C24r
25X
240 26X P5 27X CP8b
28X C25n 260 29X P4 CP6 C25r 30X CP5 C26n 280 31X
32X P3b 33X CP4
300 34X C26r 35X II late Paleocene 36X 320 1R P3a CP3 2R III 340 3R C27n
4R
360 5R C27r
6R IVA CP2 380 7R P1c C28n
8R C28r early Paleocene C29n 9R CP1b P1b 400 CP1a -Pα C29r 10R 11R C30n 420 12R Alt.#1 Alt.#2 CC26b IVB C30r 13R lower C31n C30n 440 14R A. mayaroensis C30r 15R CC25 R. fruct. C31r C31n
16R C31r 460 Maastrichtian C32n.1n 17R ? C32n.1r 18R CC24 - G. gansseri IVA G. falsostuarti C32n.2n? 480 Remagnetized 19R CC21 G.cal.- slump -CC23 G.vert. Camp. C33n? 20R CC19 Con., V -CC11 500 Turon. 21R
22R R. 520 23R VIA cushmanii C34n
24R CC9b+9c 540 "Cretaceous 25R R. Long 26R greenhorn. e Cenomanian 560 Normal 27R
R. Polarity 28R appen. Chron" 580 29R VIB CC9a 30R R. late Albian
600 31R ticinensis
Lithology legend J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 24
Figure F5. Magnetostratigraphy and polarity chron assignments for Hole 1051A. The generalized litho- stratigraphy and biostratigraphy are from Shipboard Scientific Party (1998d). The polarity rating system (see “Characteristic Directions, Polarity Rating, and Paleolatitudes,” p. 4, in “Procedures and General Magnetic Properties”) from left to right is R, RP, RPP (at left dashed line), R??, INT, N??, NPP (at right dashed line), NP, and N. (This figure is also available in an oversized format.)
Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination Age Core Recovery Calc. nanno. (mbsf) Plank. foram. Graphic Unit ° ° ° ° ° interpretation Depth -90 -45 0 45 90 R Int N CP15 C16r? 2H IA Also in shipboard data of Hole 1051B
20 3H C17n 4H C17n.1r? P14 40 5H IB C17n.2r? 6H
7H 60 CP14b C17r 8H C18n
9H 80 P13
10H
11H 100 IC C18r 12H
13H 120 14H
15H C19n 140 16H C19r 17X P12 160 18X CP14a
19X
180 20X
21X
200 22X middle Eocene C20n
23X
220 24X
25X
26X 240 CP13c
27X ID
260 28X ?
29X P11
280 30X
31X
CP13b C20r 300 32X
33X
34X 320
35X
36X 340
37X CP13a
38X 360 39X C21n P8-P10 CP12b 40X
380 41X II CP12a C21r
42X C22n 400 43X C22r CP11 44X C23n
420 P7 45X C23r
46X CP10 440 C24n 47X
48X CP9b Either an N in P6b chron C24r, or 460 49X a persistent 50X normal-polarity early Eocene overprint 51X III
480 52X C24r
53X CP9a
P6a ?
500 54X
55X
520 56X P5 CP8 57X C25n
540 58X C25r CP7
59X P4 CP5 60X 560 61X C26n
62X CP4 P3b
63X late Paleocene 580 IV C26r 64X A P3a 65X 600 lower C26r? 66X
CP3 ? 67X 620 68X IV P2 C27n 69X B 70X 71X C27r? 640 72X
73X P1c e Paleocene
Lithology legend Nannofossil Nannofossil Manganese Clay ooze chalk nodule or crust J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 25
Figure F6. Magnetostratigraphy and polarity chron assignments for composite succession of Site 1052 (composed from Holes 1052A and 1052E). The generalized lithostratigraphy and biostratigraphy are from Shipboard Scientific Party (1998e) with Campanian–Maastrichtian biostratigraphy and associated polarity assignments modified by J. Self-Train and B. Huber (pers. comm., 1998). The polarity rating system (see “Characteristic Directions, Polarity Rating, and Paleolatitudes,” p. 4, in “Procedures and General Mag- netic Properties”) from left to right is R, RP, RPP (at left vertical dashed line), R??, INT, N??, NPP (at right vertical dashed line), NP, and N. (This figure is also available in an oversized format.)
Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination Age Core Recovery Calc. nanno. Depth (mbsf) Plank. foram. Graphic Unit -90°-45° 0° 45° 90° R Int N interpretation 1X IA Core 2X polarity is from shipboard 2X C15r? long-core magnetometer IB 3X C16n 20 C16n.1r? 4X
5X 40 C16r
6X P15a CP15a
7X 60 8X C17n
9X C17n.1r 80 IC 10X C17n.2r? 11X C17r 100 12X
13X P14 CP14b C18n 120 14X
15X
16X
140 17X middle Eocene late Eocene C18r
IIA P13 Minor 18X hiatus CP14a 19X C19n 160 P12 C19r Hiatus 20X mid- C26r CP3 21X C27n 180 5R IIB C27r 6R P3a
200 7R
8R ?
220 9R CP3 10R C27r 11R 240 P2 12R
III eary Paleocene 13R 260
14R P1c
15R C28n 280
16R CP2 P1b 17R α
300 P C29n
18R CP1b Polarity from C29r shipboard pass-through 19R magnetometer 320 20R
CC26b C30n
21R 340 22R C30r? slump
IVA CC26a
23R A. mayaroensis 360 24R C31n CC25c
25R 380 26R
CC25b R. 27R slump
fructicosa
400 28R
29R CC25a 420 30R Maastrichtian IVB 31R C31r
440 32R CC24
33R
- G. gansseri G. falsostuarti 460 34R
35R CC23?
480 36R
37R VA CC10 500 38R R. green.
39R
40R e Cenomanian 520 CC9b
41R
42R 540 43R R. appenninica C34n 44R 560
45R VB "Cretaceous 46R Long 580 47R Normal
48R Polarity 600 Chron" 49R CC9a
50R late Albian 620 51R
52R
53R R. ticinensis 640 54R
55R 660 56R VC
57R
680 58R CC8b
Lithology legend Nannofossil Nannofossil Diatom Siliceous Limestone ooze chalk ooze ooze Manganese nodule Siltstone Sandstone Clay or crust J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 26
Figure F7. Magnetostratigraphy and polarity chron assignments for Hole 1053A. Generalized lithostratig- raphy and biostratigraphy are from Shipboard Scientific Party (1998f). The polarity rating system (see “Characteristic Directions, Polarity Rating, and Paleolatitudes,” p. 4, in “Procedures and General Mag- netic Properties”) from left to right is R, RP, RPP (at left vertical dashed line), R??, INT, N??, NPP (at right vertical dashed line), NP, and N.
Lithology Biostratigraphy Magnetostratigraphy Characteristic Polarity rating Polarity chron inclination
Age ° ° ° ° ° Depth Core Calc. nanno. Recovery Plank. foram. (mbsf) Graphic Unit -90 -45 0 45 90 R Int N interpretation
1H Alt#1 Alt#2 IB 2H C13r C15r 20 3H
4H P16 upper 40 C15n 5H C16n CP15b 6H C15r reduced by C16n.1r 60 winnowing? 7H lower C16n C16n 8H IC C16r is absent?
80 9H
10H
100 11H late Eocene 12H C17n?
120 13H P15 CP15a 14H
15H
140 16X 17X C17n
18X 160 ID
19X C17r 20X
180 CP14b
P14 m Eoc.
Lithology legend J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 27 N. The etermi- ° een no apparent no een es is ~30.1 es Age (Ma) 55 75 95 115 p. 58) indicate the age span of the suite andsample 95% confidence on paleolatitude. The mean paleolatitude path of the North T6, T6, Paleolatitude history of the Blake Nose margin from the late Aptian through the late Eocene. Bars on individual paleolatitude d paleolatitude individual the lateon Bars Eocene. through Aptian late the Blake the Nose history from of margin Paleolatitude 35 0
10 20 30 40 50
Paleolatitude ( Paleolatitude N) ° American plate at this location with standard deviation is indicated by the shaded band and the central solid line. There has b has line. There solid and band the shaded central the indicated by with standard location deviation is this at plate American nations (Table (Table nations sit of these latitude Paleogene. present The Late and Cretaceous the these sites through of variation paleolatitude significant data). (unpubl. and Bardot,Ogg J. L. MacNiocaill, C. by compilation modified a from is estimate paleolatitude North American Figure F8. F8. Figure J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 28 lines) Eocene and Eocene ogressively deeper by ) C22r (shipboard) top K/T C33n C30r? Not consistent between holes C26r? C29n M"-2"r Diagenetic "reversed" polarity near black shale interpretation Polarity chron C28n C29r C27r? C34n C19n C19r C20n C20r C21r? C22n C23n C24n C26n? C32n C30n C28r? N Int
Polarity rating
R
Magnetostratigraphy
al late early Albian l Aptian l m Eocene m Eocene e Age Maast.
Paleocene
e
Pl.
foram. Plank. A. H. -T.
P11 P3a P12 P1c
G.fa. P7-8 P6-7 P0-1a prim. P4-5 gorb.
P9-10 P1b mayar.
nanno. Calc.
CP1a CP6
CP12a CP3 CP2 CC24 CP9b CC7 CP11 CP10
CP12b CP13c CP14a CP13b CP1b CC26b CC8a Biostratigraphy CN14a
(mbsf)
Depth Depth 20 40 60 80 Holes A & C m 13.0 by upwards shifted depths core 1049A Hole 100 120 140 160 Composite of Site 1049 oversized format. oversized C30r C31r C31n lower C30n C24n.1r? slump C23r C19r, with overprints? interpretation Polarity chron C31n C31r C30r Alt.#1 Alt.#2 C30n Remagnetized C34n "Cretaceous Long Normal Polarity Chron" C19n ? C29r C29n C24r C25r C20r C22r C23n C24n C25n C26n C27n C32n.1n C32n.1r C28r C32n.2n? C33n? upper C21n lower C22n C26r C27r C20n C28n N Int
Polarity rating
R Magnetostratigraphy
aeAlbian late Maastrichtian eCenomanian late Paleocene late middle Eocene middle early Eocene early early Paleocene early Camp. Age
Con.,
Turon.
appen.
cushmanii
ticinensis - G. gansseri G. - greenhorn.
foram.
P11 P5 P4 P3b P6b P12 P6a
P7 P8-P10
P3a A. mayaroensis A. P1c
Plank. α R. R. R. G. falsostuarti G. R.
P1b -P
G.cal.- G.vert.
R. fruct.
nanno.
CC9a CP11a CP9a CP8b CP6 CP4 CP3 CC9b+9c CP14a CP13b CC26b CC25 CP2 Calc. ?
CP5 Biostratigraphy
CP13a CC19 CC24 CC21 CP1a CP9b CP1b CP12b -CC11 -CC23 (mbsf)
Holes A & C Depth Depth 20 40 60 80 Composite of 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 Site 1050 top C26n C24r C17n base C29r C27n C22n C19n C24r Either an N in chron C24r, or a persistent normal-polarity overprint Also in shipboard data of Hole 1051B interpretation Polarity chron ? C27r? lower C26r? C16r? C17n C17n.1r? C17n.2r? C17r C18n C18r C19n C19r C20n C20r C21n C21r C22n C22r C23n C23r C24n C25n C25r C26n C26r C27n ? ? N Int
Magnetostratigraphy Polarity rating
R
e Paleocene e middle Eocene middle late Paleocene late early Eocene early
Age
foram.
P12 P11 P8-P10 P2 P5 P4 P14 P7 P6b P13 P6a P3b P1c
Hole A P3a Plank.
nanno.
CP3
CP7 CP12b CP8 CP11 CP10 CP9b CP9a CP4 CP14a CP13b CP13a CP13c
CP14b C31r base Calc.
CP5
CP12a CP15 Biostratigraphy
(mbsf) Depth Depth 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 Site 1051 C15r upper C16n lower C16n Alt#2 C16n.1r interpretation Polarity chron C17n C17n? C17r C13r C15r reduced by winnowing? C15n C16n Alt#1 C16r is absent? N Int
Polarity rating R
Magnetostratigraphy m Eoc. m late Eocene late Age
Hole A
foram. P15 P16 Plank.
P14
nanno.
CP14b CP15a CP15b Calc.
Biostratigraphy
(mbsf) Depth Depth 20 40 60 80 100 120 140 160 180 Site 1053 slump slump Minor hiatus Hiatus Polarity from shipboard long-core magnetometer Polarity from shipboard pass-through magnetometer interpretation Polarity chron C15r? C27r C28n C16n C16n.1r? C16r C17n C17n.1r C17n.2r? C17r C18n C18r C19n C19r C26r C27n C27r ? C29n C29r C30n C30r? C31n C31r C34n "Cretaceous Long Normal Polarity Chron" N Int
Polarity rating
Magnetostratigraphy R
Maastrichtian middle Eocene late Eocene late Eocene middle aeAlbian late early Paleocene early e Cenomanian e Age
P
fructicosa
α - G. gansseri G. -
foram.
P2 P14 P13
P12 P1c R. appenninica R. P3a P15a A. mayaroensis A. R. ticinensis R. R. green. R.
P1b Plank. R. G. falsostuarti G.
nanno.
CP15a CP14b CP3 CP2 CC26b CC26a CC25c CC25b CC25a CC24 CC23? CC10 CC9b CC9a CC8b CP14a CP1b Calc.
mid- CP3 Biostratigraphy
(mbsf) Depth 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 Holes A & E Composite of Site 1052 Magnetostratigraphy of Leg 171 Transect Magnetostratigraphy WE
c b a c b a b a b a b a b a b a a b c b a
CC25 CC26 CC17 CC21 CC19 CC24 CC22 CC20 CC18 CC16 CC23 CP7 CP6 CP5 CP4 CP3 CP2 CP11 CP18 CP15 CP10 CP9 CP8 CP1 CP13 CP14 CP16 CP12 CP17 c b a b a eximius hayi levis C. floralis Eiffellithus Tranolithus trifidum phacelosus NP7 furcatus Bukryaster Quadrum Reinhardtites Aspidolithus Aspidolithus Marthasterites quadratus aculeus Calcareous Aspidolithus grillii NP9 NP8 NP6 NP5 NP4 NP3 NP2 NP1 prinsii Lithraphidites ventricosa frequens parcus constricta sissinghii Micula trifidum Quadrum parcus (B. parca) NP11 parcus parcus NP23 NP22 NP21 NP18 NP17 NP16 NP13 NP12 NP10 murus Micula Quadrum NP19-20 Nephrolithus Ceratolithoides NP15 NP14 obscurus Ceratolithoides Calculites Lithastrinus nannoplankton b a c b a b a c b a P5 P6 Dicarinella gansseri asymetrica & D. concavata Gansserina mayaroensis, P9 P8 P7 Abathomphalus & P0 P11 P13 P19 P18 P17 P16 P15 P14 P12 P10 c b a calcarata α P2 P4 P3 P1 P Globotruncanita mayaroensis contusa fructicosa, Abathomphalus elevata ventricosa havanensis Planktonic gansseri aegyptica P5 P6 foraminifers Gansserina Contusotruncana Globotruncana Globotruncanella Globotruncana Racemiquembelina Globotruncanita (Ma) AGE 65.0 71.3 83.5 33.7 37.0 41.3 49.0 55.0 57.9 61.0 C1 C1 C1 C1 C1 C1 C1 C2 C2 C2 C2 C2 C2 C2 C2 C2 C2 C3 C3 C3 C3 C3 CHRON POLARITY Correlation of magnetostratigraphy across the Blake Nose Transect. Selectedmagnetostratigraphic correlation horizons (colored Stage Danian
Lutetian
Ypresian
Bartonian Priabonian
Thanetian Selandian
m e
ll
Eocene through Campanian e Reference
PALEOCENE EOCENE Santonian Time Scale
Campanian
Maastrichtian OLIGOCENE
PALEOGENE CRETACEOUS PERIOD EPOCH (Ma) AGE 35 40 45 50 55 60 65 70 75 80 are near the stage boundaries of the Paleogene through Maastrichtian stages. Polarity Zone C22n (the boundary between the lower boundary (the Zone C22n Polarity stages. Maastrichtian the Paleogene through of nearboundaries stage the are Eocene) was middle used as a level to horizontal of strata, but this horizon currentlyindicate thicknesses relative becomes pr in an available is also (This figure transect. this of seaward km toward the sites ~1.5 Figure F9. F9. Figure J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 29 mA/m mA/m –2 Continued on Continued See table notes. intensity with no decay. no with intensity C20r has almostC20r an order has of magnitude strongerthan intensity C20n. During demagnetization, this NPP suite remains at a weak 10 at a weak suite remains this NPP demagnetization, During Underlying change. polarity with coincides drop magnetic intensity Sharp C19r C19n C20n chron chron Polarity assignment Comments Polarity column rating Polarity Characteristicmagnetization and polarity Characteristic direction Declination Inclination MAD Schematic Generalized (°C) Interval Depth Depth (mbsf) Run name Characteristic directions and polarity ratings and polarity chron assignments, Holes 1049A and 1049C. ( 1049A and 1049C. Holes assignments, chron and polarity ratings and polarity directions Characteristic (cm) facies/Core, facies/Core, Position, age, 4H-3, 30-32 43-30 33.40 270-310 43.7 45.7 13.9 NPP 4H-6, 120-1224H-6, 120-122 46-1204H-7, 30-32 46-1205H-1, 30-32 38.805H-1, 120-122 47-30 38.805H-2, 30-32 51-30 160-370 51-1205H-2, 120-122 200-origin 39.405H-3, 30-32 52-30 52-120 207.0 40.80 207.0 39.905H-3, 120-122 160-370 53-30 200-450 53-120 400-550 42.30 –39.9 41.40 –39.95H-4, 30-32 195.8 200-4505H-4, 120-122 244.2 160-370 43.80 258.2 42.90 1.85H-5, 33-35 54-30 1.8 54-120 –38.7 150-4505H-5, 120-122 231.3 370-420 –38.6 213.7 –22.15H-6, 30-32 55-33 55-120 R 45.30 R 44.40 245.7 –40.6 4.3 241.0 –32.2 6.5 56-30 150-450 1.6 200-370 46.80 45.93 –36 –49.9 R 9.2 250-400 3.9 R 230.9 150-550 RP 231.1 47.40 1.7 R 229.1 160-310 7.1 –42.7 R 235.7 –32.2 RP –49.8 188.6 RP –41.3 7.5 3.0 –62.3 9.9 5.1 R R 30.7 RP R RPP C20r 3H-3, 120-122 33-120 24.80 200-200 264.8 40.3 3.5 NPP 4H-4, 30-32 44-30 34.90 150-450 23.6 22.5 46.4 NPP 3H-6, 120-1223H-6, 36-120 29.30 250-500 82.9 3.6 12.8 RPP 3H-1, 120-1223H-2, 30-32 31-1203H-2, 120-1223H-3, 30-32 32-30 32-120 21.803H-4, 30-32 33-30 150-origin 23.30 22.403H-4, 120-122 292.03H-5, 24-26 34-30 200-origin 34-120 200-300 120-122 23.903H-5, 257.23H-6, 30-32 35-120 35-24 48.1 150-200 26.30 312.3 25.403H-7, 30-32 36-30 200-250 27.80 33.1 200-300 16.9 263.4 26.844H-1, 30-32 30.4 250-300 120-1224H-1, 37-30 240.6 100-200 11.4 180.0 NP 28.404H-2, 30-32 41-120 41-30 19.4 10.4 120-1224H-2, 200-240 67.8 NP 29.90 –70.7 38.8 42-120 42-30 58.5 31.30 10.7 NP 30.40 200-250 –32.4 149.04H-3, 120-122 150-300 32.80 270-300 NPP 7.2 9.0 66.4 31.90 43-120 120-122 299.94H-4, 150-200 5.6 28.3 140-280 72.0 NPP 355.0 INT 4H-5, 30-32 44-120 14.6 34.30 120-1224H-5, 46.9 72.2 RP 34.64H-6, 30-32 29.1 45-120 45-30 150-origin NPP 49.9 35.80 66.6 32.8 250-350 R?? 30.6 46-30 37.6 34.7 37.30 16.7 36.40 8.1 NPP 200-300 35.6 NPP 270-310 29.5 56.9 37.90 15.8 NPP NPP 140-420 29.6 358.5 48.0 16.1 NPP 32.6 NPP 56.0 47.0 3.3 7.5 NPP 6.0 0.3 NPP NPP 14.7 N?? 5H-6, 120-1225H-7, 30-32 56-120 57-030 48.30 200-300 48.90 140-420 228.9 241.0 –28.7 –40.0 8.2 13.9 RPP R 3H-1, 30-32 31-30 20.90 200-420 271.3 84.4 12.0 NPP section, interval section, Greenish to vanilla-colored ooze-chalk ooze-chalk vanilla-colored to Greenish Table T1. T1. Table next threenext pages.) middle Eocene middle ooze-chalk Lemon yellow 171-1049A- J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 30 N. → cryogenic analyses) was not observed in discrete sample suite. sample discrete in observed not was analyses) cryogenic Biostratigraphy indicateshiatus a between C22nand C23n. shipboard in 171B-1049A-9H Core lowest to (assigned C22r Zone Polarity Upward transition R C22n C23n C24n chron chron C26n? C27n? Polarity assignment Comments Polarity column rating Polarity 3.9 8.0 RPP – 14.641.1 2.9 2.4 R R C26r? 45.6 1.1 R C27r? Chronassignment based onbiostratigraphy. 38.142.436.2 16.2 4.825.3 RP 9.639.523 14.8 R 19.8 R 7.937.3 RP 16.424.3 36.320.4 RP 12.529.4 11.2 RP RPP RP 6.7 RP 9.4 RP R C21r? Below hiatus – – – – – – – – – – – – – – Characteristicmagnetization and polarity Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run name (cm) facies/Core, facies/Core, Position, age, 13H-2, 121-123 132-12113H-3, 119-122 133-119 98.41 99.89 180-480 210-480 23.6 338.4 30.7 1.9 N?? 13H-2, 30-32 132-30 97.50 240-420 43.0 13H-1, 120-123 131-120 96.9014X-CC, 4-7 200-45015X-1, 23-25 149-4 151-23 29.1 100.14 105.53 160-370 7.0 180-420 233.4 201.0 6.9 INT 37.0 2.8 N 9H-5, 120-122 95-120 69.10 150-450 334.9 40.3 5.6 N 9H-3, 120-122 93-120 66.10 150-300 225.410X-1, 120-122 101-120 39.6 70.60 200-origin 8.1 126.0 NP 12X-2, 30-32 68.0 122-30 2.6 87.90 NP 140-420 279.1 72.8 5.8 N 6H-2, 30-326H-2, 120-1226H-3, 30-32 62-30 62-1206H-4, 30-32 63-030 51.80 50.906H-4, 120-1226H-5, 30-32 64-30 200-350 64-120 52.40 150-origin6H-6, 30-32 160-310 296.6 65-30 296.0 54.80 53.906H-6, 120-1226H-7, 30-32 66-36 250-origin 66-120 311.6 200-320 55.40 304.6 67-30 160-310 57.80 265.3 27.9 56.90 200-400 150-400 286.9 58.40 47.7 318.4 160-370 292.2 RPP 278.8 7H-1, 30-32 71-30 58.90 140-420 301.3 86.2 7.0 N?? 6H-1, 30-326H-1, 120-122 61-30 61-120 50.30 49.406H-3, 120-122 300-origin 63-120 160-240 287.9 53.30 268.9 6H-5, 120-122 250-400 65-120 307.2 56.30 150-4009H-1, 56-589H-1, 120-122 294.1 9H-2, 30-32 91-56 91-1209H-2, 120-1229H-3, 35-37 92-30 92-120 63.10 62.469H-4, 23-25 93-35 300-origin 200-370 64.60 63.709H-4, 120-122 224.99H-5, 30-32 94-23 200-550 94-120 140-420 65.25 14.0 95-30 35.6 237.5 160-370 67.60 230.7 66.63 71.110X-1, 25-27 300-550 200-420 228.5 68.20 33.9 3.2 44.3 1012510X-2, 27-29 8.9 222.7 160-370 234.910X-3, 29-32 40.2 N 102-27 3.4 3.9 69.65 NPP 103-29 312.4 42.4 37.0 370-420 71.17 3.2 N N 72.69 13.5 200-370 8.612X-1, 120-122 3.6 134.2 N 200-370 121-120 325.9 6.2 N N 87.30 50.4 307.2 NPP 350-550 45.9 4.9 49.2 196.6 3.8 NP 4.0 59.9 N N 4.0 N 12X-1, 30-32 121-30 86.40 160-37013H-1, 30-32 287.4 131-30 55.2 96.00 160-370 3.4 274.8 N 63.3 2.0 N section, interval section, Light tan chalk; some chert layerssome chert tan chalk; Light early Eocene Table T1 (continued). (continued). T1 Table 13-m gap in recovery greenish brown Light 8-m gap in recovery Paleocene limestone siliceous brown clayey Grayish J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 31 condensation. 18X. Maastrichtian polarity chron assignments are difficult because of because difficult are assignments chron polarity Maastrichtian Diageneticartifact above black shale. Foraminifer biostratigraphy indicates hiatus in lowest Core 171B-1049A- Core in lowest hiatus indicates biostratigraphy Foraminifer C29r C28n C29n C30n as C30n. assigned is chron polarity then N, If C32n C33n C34n C34n chron chron Polarity assignment Comments Polarity column rating Polarity 6.0 33.3 INT 6 18.3 INT – – 23.9 13.5 RP25.8 2.9 NPP C30r? 28.948.5 4.6 18.614.4 R RPP 15.4 RPP 31.3 C28r? 6.6 RP 30.3 4.8 R41.3 13.9 RPP M-2 – – – – – – – – Characteristicmagnetization and polarity Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run name (cm) facies/Core, facies/Core, Position, age, 18X-5, 31-33 185-31 140.61 240-origin 351.2 53.7 6.4 N 18X-3, 22-24 183-30 137.52 200-origin 160.6 5.6 20.3 INT 16X-4, 38-40 164-38 119.88 140-200 134.218X-2, 120-122 182-120 28.3 137.00 19.8 210-origin NPP 158.9 18X-5, 120-122 185-120 141.50 180-30019X-1, 38-40 191-38 128.9 144.28 31-3319X-2, 54.8 200-200 192-31 11.4 281.8 145.7119X-4, 121-123 NP 194-12 180-origin 148.52 64.3 180-origin 39.8 231.2 4.0 51.5 N 3.2 N 16X-5, 113-115 165-113 122.13 000-100 178.3 61.1 6.1 INT 16X-3, 30-32 163-30 118.30 200-310 244.2 18X-4, 120-122 184-120 140.00 210-origin 189.2 27.7 9.7 NPP 19X-3, 30-32 193-30 147.20 270-330 265.1 16.1 42.9 NPP 15X-CC, 3-516X-1, 30-32 159-316X-1, 118-120 161-30 161-11816X-2, 30-32 105.8316X-2, 120-122 116.18 115.30 162-30 162-120 210-480 200-31016X-3, 114-116 160-310 117.70 116.80 163-114 151.8 180-27016X-4, 109-111 143.4 240-420 119.14 164-10916X-5, 27.6 28-30 36.6 180-300 267.6 120.59 214.4 58.0 165-28 58.0 140-300 224.2 2.7 121.28 23.9 48.0 23.9 175.6 200-270 24.6 N NPP 6.0 NPP 138.8 65.7 1.418X-3, 120-122 N 183-12018X-4, 26-28 37.6 NP 138.50 184-22 INT 180-270 139.06 180-origin 64.1 164.5 19X-2, 103-105 192-10319X-3, 123-125 146.43 193-123 180-origin19X-4, 31-33 148.1319X-5, 33-35 277.8 194-31 140-30019X-CC, 26-28 195-3320X-1, 49-51 199-26 148.71 121-12320X-1, 260.4 150.23 201-121 201-49 150.84 180-origin 154.71 300-origin20X-2, 30-32 180-origin 153.99 44.5 194.520X-2, 114-116 210-origin 226.3 202-30 240-origin 180.7 202-11420X-3, 44-46 58.8 9.8 40.3 156.14 222.6 155.30 203-44 58.0 64.3 210-400 220-260 NP 156.94 4.5 87.6 2.5 3.5 200-origin 120.8 50.6 N 7.5 218.9 NP N 53.7 42.7 NPP 26.3 1.6 NPP NPP 18X-2, 30-32 182-30 136.10 180-origin 245.5 13.9 12.3 NPP 19X-1, 140-142 191-140 145.30 240-origin 186.8 22.6 5.9 NP 18X-6, 31-33 186-31 142.11 220-origin 3.6 36.2 3.8 N section, interval section, Gray marl to cream chalk Table T1 (continued). (continued). T1 Table in sampling gap 14-m Maastrichtian chalk White Campanian late early Albian Red-white cycles late Aptian (below organic-rich shale) J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 32 each sample. Declination and inclination are c vectors to obtain the characteristic direction. The polarity direction.the characteristic to obtainc vectors ents ents are onbased the polarity pattern and biostratigraphic of orgray hatchure fill in the schematic column the reflecting R?? apparent polarity is considered anomalous. is considered apparent polarity R?? condensation. h hole are on the associateddisplayed magnetostratigraphic fig- ← of because difficult are assignments chron polarity Maastrichtian K/T =interval 171B-1049C-8X-5,90cm. C29r C29r C34n C30n C32n chron chron Polarity assignment Comments Polarity column rating Polarity Characteristicmagnetization and polarity Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run name C) indicates the demagnetization range that was used to compute the characteristic direction and polarity of magnetizationand direction polarity characteristic for to compute demagnetization the was used that the range C) indicates ° (cm) in degrees. MAD (mean angular dispersion) values indicate the precision of the three-dimensional line fit of these paleomagneti of these fit three-dimensional line of the precision indicate the values degrees. (mean angular MAD dispersion) in N) polarity in is explained columnsthe text. are Two shown with the shades NP, N??, NPP, R??, INT, RPP, rating system (R, RP, assignm chronpolarity intervals. the main Polarity generalized column indicating and the individual samples of rating polarity to constraints in correlating polarity magnetic the reference scale. time ure. Interval ( facies/Core, facies/Core, Position, age, 9X-4, 65 120.85 NPP 10X-3, 75 123.95 NP 20X-6, 27-29 206-27 160.77 140-350 319.4 39.9 4.8 NPP 10X-2, 7510X-6, 75 122.45 128.45 N?? N 8X-5, 22 112.32 INT 20X-3, 120-122 203-2020X-4, 40-42 30-3220X-5, 204-40 157.70 205-30 100-400 158.4021X-1, 30-32 159.8021X-1, 119-121 180-origin 303.1 211-30 211-119 200-origin21X-2, 19-21 300.821X-2, 129-131 164.29 163.40 212-19 212-129 30.121X-3, 35-37 40.4 150-40022X-1, 30-32 260-origin 165.89 50.9 164.79 213-3522X-2, 30-32 59.1 31.8 221-30 101.3 180-origin 134.6 200-origin 166.45 15.5 222-30 NPP 256.6 173.00 191.1 4.7 180-origin 62.8 173.75 NPP 72.5 200-330 263.2 57.4 180-origin8X-2, 87 57.5 N 11.18X-3, 66 5.0 221.8 178.78X-4, 56 42.1 3.2 NP 3.0 NPP 26.6 61.7 5.6 N N 11.8 6.8 N 8X-7, 14 108.47 NP 9X-1, 75 109.76 N 9X-2, 75 111.169X-3, 7510X-1, 75 115.24 116.4510X-4, 75 117.9510X-5, 75 119.45 120.95 125.45 126.95 R?? INT R?? NPP INT N?? R?? NP NPP N 8X-6, 28 113.88 R?? 8X-1, 97 107.07 INT section, interval section, Table T1 (continued). (continued). T1 Table Red-white cycles early Paleocene interval boundary K/T 171B-1049C- Maastrichtianlate 113.00 Notes: Sediment facies are generalized color-texture fromdescriptions shipboard observations, and the lithologic units for eac White chalk White J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 33 Continued on Continued See table notes. -rated sample behavior in this interval.-rated sample behavior in ” N “ No C19r C19r C19n C20n chron chron Polarity assignment Comments Overprinted? Overprinted? Polarity column rating Polarity 5.4 15.0 INT 1.6 27.7 INT – – 52.1 8.6 R 12.7 16.339.7 RP 16.740.4 RP 18.9 10.141.4 25.7 R 15.1 RP RPP 17.4 33.8 RPP 36.7 21.6 RPP resolved. is poorly C19r Zone Polarity – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name Characteristic directions and polarity ratings and polarity chron assignments, Holes 1050A and 1050C. ( 1050A and 1050C. Holes assignments, chron and polarity ratings and polarity directions Characteristic (cm) facies/Core, facies/Core, Position, age, 1X-2, 30-32 012-030 1.80 270-350 172.2 3H-6, 30-32 036-030 27.40 270-480 39.8 50.4 12.4 NP 2H-3, 30-32 023-030 13.40 210-270 234.9 57.9 11.1 N?? 3H-4, 30-323H-4, 120-122 034-030 034-120 24.40 25.30 300-480 140-255 238.6 54.0 2H-5, 30-32 025-030 16.40 300-400 230.83H-2, 120-122 032-120 55.4 22.30 180-255 5.9 186.2 NP 26.0 14.4 NP 4H-4, 120-122 044-120 34.80 100-350 240.0 50.4 11.4 NPP 1X-1, 120-122 011-120 1X-2, 120-1221X-3, 30-32 012-120 1.201X-3, 120-122 140-3301X-4, 30-32 013-030 013-120 2.701X-4, 120-122 143.4 180-3301X-5, 30-32 014-030 3.30 014-120 4.202H-1, 30-32 180-330 280.1 255-3302H-1, 120-122 015-030 4.80 72.4 5.70 021-030 021-120 210-300 140-2402H-2, 64.3 120-122 87.0 6.30 73.0 21.6 10.40 11.30 022-120 180-270 101.52H-3, 120-122 180-240 140-300 2.5 16.0 NPP 24.7 26.9 12.80 023-120 183.72H-4, 120-122 155.9 140-300 31.7 NPP 64.8 15.9 14.30 21.7 5.3 024-120 2H-5, 120-122 203.8 300-450 33.5 0.9 56.6 NPP 15.80 025-120 3.8 N 140-270 INT 48.8 10.0 28.5 52.42H-7, 17.30 30-32 INT 3H-1, 45-47 250.5 140-300 INT 3H-1, 19.1 104-106 INT 027-030 3H-2, 30-32 031-045 031-104 64.5 19.40 51.0 N?? 20.053H-3, 20.64 30-32 270-400 032-030 3H-3, 14.6 120-122 140-330 150-450 21.40 033-030 033-120 47.3 101.4 270-400 272.2 NP 22.903H-5, 23.80 30-323H-5, 120-122 140-330 180-255 74.3 77.4 42.0 035-030 035-120 3H-6, 120-122 226.1 193.4 25.90 16.73H-7, 26.80 30-32 39.1 036-120 5.04H-1, 30-32 180-270 140-300 19.3 NPP 4H-2, 28.30 120-122 037-030 11.1 N 4H-3, 30-32 041-030 140-255 042-120 54.8 78.4 28.904H-4, 14.1 30-32 N 29.40 31.80 180-270 043-030 61.5 4H-5, 30-32 180-240 INT 044-030 020-150 10.4 51.7 32.404H-6, 30-32 37.3 33.90 174.2 210-400 045-030 160.8 15.5 18.2 180-330 046-030 35.40 212.1 44.9 INT NP 36.90 66.3 227.6 180-270 7.0 180-240 11.3 59.1 190.3 22.7 8.6 51.3 198.4 NP 18.1 NPP NPP 27.0 20.8 55.9 NP 29.4 NPP 27.3 NPP NPP 2H-2, 30-32 022-030 11.902H-4, 30-32 180-210 024-030 23.8 14.902H-6, 30-322H-6, 120-122 180-330 026-030 62.3 026-120 241.2 17.90 18.80 14.3 140-330 140-300 51.9 R?? 216.3 43.6 7.6 37.5 N 10.2 NP 1X-1, 30-32 011-030 0.30 210-330 201.5 60.3 20.2 NPP section, interval section, Table T2. T2. Table next nine pages.) pages.) nine next middle Eocene middle ooze-chalk white Yellowish 171B-1050A- J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 34 C20r C20n chron chron Polarity assignment Comments Polarity column rating Polarity 1.5 8.7 RPP 3.9 7.4 RPP – – 18.348.234.1 18.5 9.7 13.0 R R RPP 25.9 37.6 INT 10.9 15.7 RPP 81.017.9 17.712.915.7 RPP 6.9 14.6 18.8 RPP RPP 29.2 RPP 48.9 12.936.1 22.8 RP 19.852.8 RPP RP 14.7 RP 52.749.840.9 2.737.1 6.030.2 15.635.4 R 6.3 R RP 7.0 38.6 R R RPP 49.0 26.9 RPP – – – – – – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 5H-3, 31-33 053-031 41.91 210-300 113.8 37.1 37.7 NPP 10H-4, 33-3510H-5, 122-124 104-033 105-122 10H-6, 30-32 90.93 93.32 106-030 180-240 250-400 93.90 227.2 350-480 219.6 217.5 5H-1, 30-325H-1, 120-1225H-2, 30-32 051-030 051-120 5H-2, 118-120 38.90 39.80 052-030 052-1185H-3, 118-120 210-300 140-330 40.405H-4, 120-122 41.28 053-118 5H-5, 31-33 277.7 180-270 116.4 054-120 100-3005H-6, 42.78 31-335H-6, 44.30 120-122 150.4 055-031 150-350 52.4 50.3 25.75H-7, 31-33 056-031 180-270 056-120 44.916H-1, 30-32 72.6 59.8 46.41 23.56H-2, 47.30 20.5 30-32 180-300 057-031 147.4 6H-4, 30-32 180-210 061-030 140-240 47.91 38.2 NPP 6H-6, 30-32 276.4 062-030 NP 32.6 48.40 50.97H-1, 30-32 120.3 180-400 064-030 297.4 49.90 NPP 7H-3, 30-32 180-240 066-030 46.1 8.27H-3, 23.1 120-122 52.90 156.9 240-300 071-030 57.2 55.90 63.27H-4, 30-32 318.1 073-030 073-120 140-210 57.90 33.57H-4, 120-122 NPP 325.2 180-270 NP 60.90 28.37H-5, 61.80 13.8 30-32 210-270 074-030 182.0 074-120 62.97H-6, 30-32 INT 313.8 210-300 180-270 58.9 62.407H-7, 63.30 31-33 INT NPP 343.5 075-030 15.98H-2, 31-33 70.4 347.0 140-180 076-030 332.6 140-300 49.9 63.90 22.98H-2, 121-123 077-031 43.8 65.40 NPP 8H-4, 30-32 146.2 19.9 180-300 082-031 251.2 082-121 31.7 66.91 22.7 50.6 NPP 8H-5, 30-32 180-210 68.91 15.78H-6, 69.81 30-32 179.8 140-210 NPP 084-030 34.4 12.4 NPP 163.6 180-240 085-030 100-150 5.5 71.909H-3, 30-32 184.0 NP 086-030 73.40 17.1 120-1229H-3, 179.9 240-270 NP 221.7 74.90 N 180-210 093-120 093-030 9H-6, 28-30 R?? 240-300 38.9 80.37 79.47 27.69H-7, 28-30 177.3 200-400 186.5 140-180 096-028 15.5 097-028 55.2 54.0 83.9510H-3, 30-32 51.5 1.8 85.45 180-240 RPP 24.9 41.1 103-030 240-400 343.4 INT 89.40 INT 335.4 11X-1, 10-11, 180-240 111-010 2.8 190.9 95.70 14.8 180-300 INT 63.5 9H-1, 42-44 091-042 9H-5, 28-30 77.02 180-210 095-028 82.45 343.8 000-000 16.6 17.011X-4, 7-9 INT 11X-4, 124-126 114-124 11X-5, 115-117 114-007 115-115 11X-6, 32-34 101.34 100.1712X-1, 95-97 102.75 140-240 116-023 150-290 140-240 121-095 103.42 312.9 106.15 140-210 37.3 98.4 140-240 INT 252.1 38.5 10H-1, 121-123 101-121 87.31 140-180 184.4 section, interval section, Table T2 (continued). (continued). T2 Table ooze-chalkGreenish white White chalk White J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 35 within C23r. ? Normal polarity zone probably either is a pervasive overprint or a subchron C23n chron chron Polarity assignment Comments lower C22n upper C21n Hiatus assigned from calcareous nannofossil biostratigraphy. Polarity column rating Polarity 0.3 35.4 INT – 30.715.723.7 3.520.6 4.3 4.9 RP 19.6 R R RPP 40.435.336.6 6.657.6 3.7 6.7 11.7 R R RP R 40.152.534.1 10.338.5 9.633 2.3 R 37.9 RP R 4.2 RPP R 26.530.720.0 7.9 11.0 C22r 32.2 RPP RP RPP 37.441.5 18.028.0 RP 6.6 11.0 R RPP C23r C23r 43.642.839.5 12.0 8.5 RP 3.7 RP R – – – – – – – – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 19X-1, 134-136 191-134 173.74 140-270 133.3 44.2 7.9 N 17X-1, 123-126 171-123 17X-2, 46-4917X-2, 118-121 154.43 172-046 172-118 17X-3, 113-116 210-240 173-113 155.16 155.88 157.33 230-290 241.0 210-330 180-300 153.4 36.9 137.8 19X-6, 27-29 196-027 180.17 150-230 267.3 26.1 8.1 NPP 13X-1, 10-12 131-010 114.90 210-300 300.9 15X-5, 28-3016X-1, 114-116 155-028 161-114 16X-3, 52-5416X-5, 129-132 140.28 144.74 163-052 165-129 230-320 140-300 147.12 150.8917X-1, 51-54 150-320 237.5 140-300 49.9 171-051 244.8 255.0 153.71 38.7 41.5 270-30018X-1, 27-29 55.0 41.3 13.0 1.6 41.6 181-027 163.07 1.9 4.8 NP N 18X-3, 15-17 210-300 38.0 N N 183-015 18X-4, 38-40 268.9 3.018X-4, 126-128 165.95 184-038 184-126 180-300 167.68 168.56 NP 19X-1, 29-31 140-180 140-240 56.5 191-029 19X-2, 23-25 248.2 123.019X-2, 118-120 172.69 192-023 192-118 19X-3, 41-43 150-26019X-4, 31-33 174.13 175.08 32.6 40.8 193-041 273.9 140-240 140-300 194-031 19X-5, 27-29 175.81 10.219X-5, 127-129 177.21 0.9 228.5 210-250 133.5 195-027 195-127 34.3 140-270 NP 178.67 179.67 100.1 NP 19X-6, 118-120 52.4 26.1 348.0 210-270 180-240 8.5 196-118 20X-1, 109-111 181.08 311.6 6.2 6.7 NP 201-109 8.1 270-33020X-2, 124-126 183.09 NP 202-124 20X-3, NP 24-26 42.4 199.2 180-255 50.5 184.74 203-024 196.3 180-210 0.9 185.24 11.7 180-210 43.2 NP NP 257.0 37.6 37.6 21.0 10.9 NPP NPP 13X-2, 100-102 132-100 13X-4, 82-8413X-5, 138-140 117.30 134-082 135-138 150-290 120.12 122.18 180-240 180-270 27.2 199.2 11.1 18X-1, 115-117 181-115 18X-2, 32-3418X-2, 123-125 163.95 182-032 182-123 270-30018X-3, 121-123 164.62 165.53 183-121 150-320 270-300 51.3 167.01 254.5 211.0 140-330 163.9 50.219X-4, 98-100 6.4 194-098 NP 177.88 140-300 343.7 20X-1, 34-36 201-034 20X-2, 33-35 182.34 202-033 140-300 183.83 250-290 40.4 95.7 14X-6, 30-32 146-030 132.20 250-320 277.6 15X-1, 9-1115X-3, 27-2915X-4, 8-10 151-009 153-027 134.09 137.27 154-008 140-240 140-300 138.58 140-180 149.7 6.9 316.9 26.9 18.6 R?? section, interval section, Table T2 (continued). (continued). T2 Table in sampling gap 10-m Light-gray chalk early Eocene Light-green chalk-limestone J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 36 C24r C24r C24n C24n chron chron Brief N Brief Polarity in C24r? subchron assignment Comments Polarity column rating Polarity 3.0 14.6 R?? 8.87.8 10.5 42.8 RPP RPP 5.2 6.77.8 RPP 7.3 INT – – – – – 22.120.9 20.1 31.7 R RP 34.2 23.7 RPP 36.2 30.3 RPP 60.5 4.8 R40.056.2 28.922.212.5 RPP 5.0 7.2 24.5 R R RPP C24n.1r? 53.730.1 31.1 28.3 RPP RPP 10.910.434.5 6.9 13.6 15.8 RPP RPP 26.5 RP 39.0 RPP 34.521.727.4 5.6 6.1 4.1 R RP R 22.431.9 5.3 21.5 R RPP – – – – – – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 21X-1, 33-35 211-033 189.93 210-290 245.221X-5, 28-31 58.4 215-028 195.88 6.8 140-270 NP 127.1 34.0 13.6 NP 22X-4, 124-126 224-124 22X-5, 28-3022X-6, 33-35 204.94 225-028 300-500 226-033 205.48 207.03 140-300 157.2 180-300 310.2 307.4 13.723X-CC, 26-28 36.9 239-026 R?? 218.53 150-210 118.2 23X-1, 18-20 231-018 208.98 210-270 236.8 22X-CC, 20-22 229-020 208.88 150-260 303.5 26.9 19.1 NPP 20X-3, 128-130 203-128 20X-4, 7-9 186.2820X-6, 54-56 140-300 204-007 20X-6, 115-117 206-054 186.57 206-115 20X-7, 10-12 21.1 190.04 190.65 140-270 207-010 21X-2, 27-29 190-260 140-25521X-3, 33-35 191.10 206.9 53.9 212-027 21X-4, 30-32 354.2 180-270 132.7 213-033 191.37 14.0 214-030 37.221X-6, 28-31 192.93 286.0 180-240 137-13921X-6, 47.4 194.40 37.4 140-270 216-137 216-028 NP 21X-CC, 9-11 304.7 150-320 5.4 198.4722X-1, 32-34 197.38 15.7 10.4 193.6 219-009 22X-2, 29-31 180-210 150-290 221-032 199.15 N 28.5 NPP 9.0 NP 222-029 42.4 199.52 180-270 157.1 8.1 200.99 23.3 180-270 49.4 10.0 151.0 190-290 32.4 NPP 64.9 27.9 22X-6, 124-126 165.2 NP 6.2 226-124 38.8 30.0 207.94 N NPP 180-330 NPP 23X-2, 33-3623X-3, 19-21 232-033 13.923X-4, 25-27 233-019 23X-4, 115-117 210.63 234-025 234-115 23X-5, 28-30 211.99 250-290 23.423X-6, 60-62 213.55 214.45 180-270 235-028 126.2 180-210 140-240 10.0 236-060 24X-1, 27-29 215.08 176.8 24X-2, 29-31 216.90 310.5 150-190 137.6 NPP 241-027 24X-3, 27-29 270-300 242-029 218.67 99.3 243-027 24X-5, 72.4 25-27 220.19 180-210 54.0 24X-6, 13-15 221.67 180-240 245-025 24X-6, 112-114 12.2 146.9 190-260 14.2 246-013 246-112 24X-CC, 11-13 224.65 54.3 226.03 227.02 249-011 INT 348.1 210-250 12.0 180-210 227.96 240-255 106.6 140-180 R?? 288.3 92.827X-3, 20-22 58.2 56.1 273-020 244.90 14.8 250-340 INT 241.5 21X-1, 105-107 211-105 190.65 180-240 306.2 34.422X-3, 23-25 9.022X-4, 40-42 223-023 NPP 224-040 202.43 204.10 180-270 250-320 157.0 54.6 24X-4, 44-46 244-044 223.34 140-210 240.3 34.827X-4, 23-25 22.427X-4, 135-137 274-023 274-135 R?? 246.43 247.55 180-250 200-360 156.2 7.8 27X-1, 34-36 271-034 242.04 180-340 254.8 27X-2, 34-36 272-034 243.54 300-330 13.9 section, interval section, Table T2 (continued). (continued). T2 Table 13-m gap in recoveryand sampling Paleocene late J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 37 depth interval. C25n C26n chron chron Polarity assignment Comments Polarity column rating Polarity 5.8 15.3 INT – 32.130.917.1 3.837.4 8.311.6 6.5 R 5.0 13.1 R RP R RPP 25.618.5 5.2 8.3 R RP30.431.934 5.2 2.8 R 6.023.4 R 33.8 R 24.5 5.232.4 19.6 C24r51.5 4.931.2 R RPP 6.927.4 LowermostCore 171B-1050A-27X overlaps uppermostCore 28x assigned 3.130.2 R 4.642.5 R 9.447.1 19.2 R 21.0 R 7.8 RP 15.5 RP 9.711.4 14.015.6 14.1 R RP 13.3 RPP 23.4 RPP 31.0 RP 24.6 RPP 19.3 19.6 RPP RPP C25r 23.3 12.1 RP 10.8 14.023.338.7 RPP 8.7 13.3 R RP – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 29X-1, 30-32 291-030 257.20 180-210 319.7 13.1 6.7 N?? 31X-2, 116-119 312-116 277.62 100-290 254.0 39.4 9.7 NP 28X-1, 120-123 281-032 27X-5, 110-112 281-120 28X-2, 36-38 248.5028X-2, 132-134 248.80 180-270 282-036 282-132 28X-3, 33-35 200-290 249.16 250.12 147.4 283-033 220-280 140-320 91.0 250.63 255.3 220-310 64.2 307.5 28X-1, 32-34 275-021 247.62 180-310 19.8 28X-3, 104-106 283-104 251.34 140-45028X-5, 116-118 285-116 112.4 29X-1, 80-82 254.46 140-290 291-080 29X-2, 19-21 257.70 178.6 292-019 220-310 258.59 32.5 225.7 180-280 297.4 6.230X-3, 109-111 N 303-109 30X-4, 18-20 270.59 304-018 30X-5, 31-33 170-29030X-5, 114-116 271.18 305-031 305-114 30X-6, 52-54 180-240 236.4 30X-6, 110-112 272.81 273.64 306-052 306-110 30X-7, 8-10 220-280 140-170 13.6 31X-1, 29-32 274.52 275.1031X-2, 27-30 307-008 180-310 261.7 170-290 93.9 311-027 275.58 312-027 31X-3, 15-18 276.39 123.2 122.2 140-23031X-3, 116-119 276.73 180-250 16.3 313-015 313-116 31X-4, 24-27 180-210 221.8 278.11 279.12 19.9 314-024 31X-5, 24-27 2.8 180-280 100-14031X-5, 115-118 279.70 3.8 NPP 41.2 315-024 315-115 31X-6, 35-38 333.5 250-280 13.4 56.831X-6, 110-113 281.20 282.11 316-035 47.7 316-110 31X-7, 30-33 150-260 140-200 37.1 20.831X-8, 25.7 29-31 282.81 283.56 75.8 317-030 18.532X-1, 25-27 210-300 140-290 19.1 318-029 87.8 NPP 284.26 16.1 N?? 321-025 NPP 285.23 4.9 150-230 254.7 67.6 285.95 NPP 280-340 11.2 0.2 N?? 169.4 190-320 295.2 5.2 8.5 141.5 7.9 0.4 23.1 R?? 2.0 R?? 5.8 INT 17.1 INT R?? 27X-5, 21-23 275-110 247.91 200-400 293.4 28X-4, 31-3328X-4, 112-114 284-031 284-112 28X-5, 54-56 252.11 252.92 285-054 190-320 240-330 253.8429X-1, 126-128 226.0 220-310 55.7 291-126 29X-3, 92-94 258.16 176.529X-6, 41-43 200-290 293-092 29X-6, 102-104 296-041 296-102 29X-7, 43.0 46-48 260.82 275.2 30X-1, 53-55 264.81 265.42 180-280 297-046 30X-1, 134-136 180-340 200-290 6.4 301-053 301-134 30X-2, 57-59 266.36 72.4 30X-3, 16-18 267.03 267.84 192.1 210-300 130.9 302-057 N 250-310 170-260 303-016 268.57 330.4 30X-4, 98-100 269.66 127.2 180-310 146.3 180-220 304-098 343.4 271.98 104.2 140-200 171.6 31X-4, 130-133 314-130 280.76 170-290 33.032X-1, 113-115 13.7 321-113 286.83 16.6 320-450 INT 301.8 section, interval section, Table T2 (continued). (continued). T2 Table J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 38 depth interval. depth interval. LowermostCore 171B-1050A-33X overlaps uppermostCore 34x assigned chron chron Polarity assignment Comments Polarity column rating Polarity 0.9 8.3 R?? 9.7 5.6 RP8.9 5.0 RPP 7.6 10.47.8 RPP 7.4 3.0 LowermostCore 171B-1050A-32X overlaps uppermostCore 33x assigned 9.1 RP 2.0 RPP 25.1 RPP 1.0 6.5 R?? 9.8 11.81.1 RPP 5.3 17.5 28.9 RPP RPP – – – – – – – – – – – 16.715.113.3 4.310.7 6.627.8 5.014.9 R 4.4 14.7 R R 3.0 R RP R 22.3 11.0 C26r R 16.532.623.7 3.914.5 3.5 5.2 R 4.3 RP R RP 16.514.319.2 3.9 5.719.8 4.230.7 R R 5.3 R 8.7 R 10.9 R 49.4 15.911.1 38.1 RPP 11.5 RPP 12.6 R?? 23.4 15.023.5 15.0 RPP 13.025.1 RP RPP 31.6 3.717.6 6.8 RP 28.5 20.9 R 17.9 RPP RPP – – – – – – – – – – – – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 33X-5, 121-123 335-121 296.11 140-290 194.5 32X-4, 104-106 324-104 33X-2, 119-121 332-119 33X-3, 38-41 291.2433X-3, 125-127 291.59 170-260 333-038 333-125 33X-4, 34-36 290-36033X-4, 123-125 292.28 293.15 181.3 334-034 334-123 33X-5, 33-35 230-320 288.0 170-320 293.74 294.63 335-033 226.6 210-340 359.1 140-320 295.23 319.2 190-290 326.1 182.4 34X-3, 106-108 343-106 34X-CC, 23-25 299.36 349-023 299.85 140-320 210-270 326.2 76.5 32X-2, 44-46 322-044 287.64 180-300 6.4 34X-1, 25-27 341-025 34X-1, 118-120 295.55 341-118 190-260 296.48 153.8 200-29034X-2, 114-116 342-114 66.2 11.8 297.94 230-400 7.635X-1, 30-32 342.5 35X-1, 116-118 N?? 351-030 351-116 35X-2, 33-3535X-2, 117-119 305.20 306.06 352-033 352-117 35X-3, 40-42 180-250 200-26035X-3, 119-121 306.73 307.57 353-040 353-119 35X-4, 22-24 182.1 280-310 303.2 260-36035X-4, 128-130 308.30 309.09 354-022 354-128 35X-5, 35-37 123.4 210-240 327.8 140-20035X-5, 119-121 309.62 310.68 9.4 355-035 355-119 35X-6, 34-36 250-310 248.0 140-260 70.7 311.25 312.09 18.1 356-034 35X-7, 32-34 215.6 240-270 319.3 150-25036X-1, 21-22 312.74 37.8 INT 357-032 36X-1, 115-117 159.7 180-280 181.3 361-021 361-115 26.3 314.22 32.136X-2, 118-120 315.65 314.71 193.3 310-330 362-118 28.2 200-290 220-220 2.1 N?? 36X-3, 124-126 317.18 100.9 363-124 36X-4, 46-49 INT 183.3 230-320 144.6 10.636X-CC, 5-7 318.74 364-046 140-450 33.8 R?? 319.46 369-005 47.4 319.64 180-310 338.1 220-280 67.3 180.0 INT 4.8 15.6 R?? 32X-3, 49-5133X-1, 43-45 323-049 33X-1, 123-125 331-043 331-123 33X-2, 37-39 289.19 289.33 290.13 290-320 332-037 260-320 140-230 290.77 158.2 117.0 310-380 171.9 287.5 33X-6, 27-2934X-2, 23-25 336-027 33X-6, 111-113 342-023 336-111 296.6733X-CC, 32-34 297.03 297.51 250-34034X-3, 31-33 339-032 180-340 170-360 117.3 298.07 343-031 192.5 190-290 37.2 298.61 150-230 59.0 305.2 35X-6, 118-120 356-118 313.58 260-32036X-2, 35-37 221.8 362-035 36X-3, 30-32 316.35 363-030 220-340 317.80 180-300 6.4 38.5 section, interval section, Table T2 (continued). (continued). T2 Table J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 39 C28r C27n C28n chron chron Polarity assignment Comments Polarity column rating Polarity 9.1 RPP 20.7 5.7 RPP 18.0 9.5 RPP 7.7 9.5 RPP 18.2 – – – – 16.622.724.6 20.8 RPP 14.1 8.9 RPP 24.6 16.8 RPP 2.8 R 41.9 7.8 R 38.921.7 11.0 RP14.2 7.7 RPP 22.3 28.6 RPP 40.5 20.6 RPP 32.4 7.6 R 31.7 6.9 R 4.7 R 4.2 R C27r 46.528.833.3 15.4 RP 10.1 RP 19.1 RPP C26r 45.5 5.7 R – – – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 3R-2, 35-37 032-035 338.55 180-250 45.3 39.6 2.4 NPP 7R-1, 67-69 071-067 375.87 180-420 303.3 31.1 9.7 N 8R-4, 54-56 084-054 389.44 170-230 60.5 2R-4, 32-34 024-0322R-6, 6-9 331.922R-7, 30-32 180-2403R-1, 31-3325-27 026-006 027-030 67.1 3R-3, 74-76 031-031 033-025 334.66 336.403R-4, 26-28 337.01 200-300 339.953R-5, 140-230 035-0744R-1, 100-290 19-21 140-200 034-026 109.5 343.414R-2, 36-38 88.8 341.434R-3, 13-15 140-200 041-019 39.0 26.2 4R-4, 180-240 68-70 18.7 042-036 31.3 NPP 45.5 346.49 54.1 116.4 043-013 348.16 34.4 10.4 NPP 47.4 176.9 230-320 10.3 044-068 349.43 18.1 5R-1, 200-270 50-52 351.48 10.0 165.1 140-290 NP 45.5 NP 166.15R-3, 200-300 20-22 051-050 NP 107.15R-4, 69-71 17.8 356.405R-5, 52-54 053-020 38.6 200-300 054-069 N 359.10 055-052 361.09 180-340 94.9 362.23 140-320 200-300 56.1 284.1 55.36R-5, 91-936R-6, 22-246R-7, 28-30 065-0916R-CC, 4-6 066-022 372.41 067-028 373.22 240-470 069-004 374.78 230-3207R-2, 28-30 215.3 240-470 375.227R-3, 8-10 233.9 140-4007R-4, 39-4239-41 072-028 212.0 8R-1, 38-40 44.1 073-008 376.98 354.8 8R-2, 37.4 074-039 082-0398R-3, 140-400 17-19 52.2 378.28 081-038 7.8 380.09 386.79 32.8 4.7 300-420 385.28 271.4 100-290 140-260 083-017 3.8 N 180-270 165.5 N 3.6 388.07 342.6 134.0 41.7 N 24.8 30.5 NPP 134.6 200-420 N 46.5 35.8 4.0 77.0 36.7 7.2 7.7 N 11.7 N N NP 4R-5, 41-434R-6, 27-29 045-0415R-2, 65-67 046-027 352.71 354.07 140-320 052-065 220-340 358.055R-6, 23-25 33.4 274.56R-1, 140-170 70-726R-2, 80-82 056-023 140.9 061-070 363.44 062-080 366.20 200-320 367.80 180-380 156.9 140-320 245.9 222.6 2R-1, 32-34 021-03245-47 327.42 140-3202R-5, 025-045 333.55 61.8 100-230 253.9 56.6 23.4 NPP 2R-2, 29-312R-3, 52-54 022-029 023-052 328.89 330.62 200-300 140-290 306.6 157.6 6R-4, 103-105 064-103 371.03 140-260 3.9 32.1 5.6 N 6R-3, 28-30 063-028 368.78 200-470 207.4 section, interval section, Table T2 (continued). (continued). T2 Table Paleocene late basal Green-gray chalk 171B-1050C- early Paleocene chalk in gray Greenish cycles Pinkish-greenish cycles in gray chalk in cycles Pinkish-greenish J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 40 uncertain. Remagnetized to reversed-polarity during slumping. Original polarity C29r C29n C30n C31n C31n chron chron C30r? C30n. Zone interval polarity within a remagnetized this is Alternatively, C31n? C30n. Zone polarity still this is C31n? Alternatively, C30n. Zone polarity still this is Alternatively, C31n? C30n. Zone of polarity part lower the this is Alternatively, C33n? Polarity C32n.1n C32n.2n assignment Comments Polarity column rating Polarity 33.3 6.1 RPP 22.2 3.1 R ? 30.9 19.2 RPP 51.1 19.0 RP 35.1 2.0 R 13.2 4.3 R 18.226 4.3 3.2 R R1714.9 5.1 R 3.7 R 45.851.944.7 2.7 R 50.3 4.6 R 3.8 R 4.5 R ? C30r. Zone polarity this is Alternatively, C31r C32n.1r 31.3 3.8 R – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 9R-2, 26-28 092-026 396.26 250-280 100.9 15R-6, 64-6615R-7, 23-25 156-06416R-1, 27-29 157-023 450.74 161-027 451.83 380-470 452.47 230-320 323.5 100-360 207.9 114.2 69.6 45.9 13.4 3.6 NP N 9R-3, 16-18 093-016 397.66 150-250 153.8 0.3 14.0 R?? 13R-5, 36-39 135-036 429.66 330-47015R-2, 14-16 308.3 152-014 444.24 180-420 143.4 51.1 3.6 N 13R-3, 56-5813R-4, 51-53 133-056 134-051 426.86 428.31 180-340 140-400 344.6 123.3 46.9 13.6 N 19R-1, 128-130 191-128 482.28 230-600 336.7 17R-2, 20-22 172-020 463.50 100-520 79.0 38.7 6.9 N 9R-1, 24-26 091-024 394.74 140-290 107.4 23.8 13R-1, 30-32 131-030 8.9 423.60 N 240-36013R-6, 16-18 151.5 136-016 430.96 100-60015R-3, 25-27 97.4 153-025 445.85 45.9 440-600 2.4 16R-1, 83-85 5.0 161-083 N 17R-1, 82-84 453.03 270-470 171-08218R-1, 34-36 462.62 298.2 181-034 240-420 471.74 144.5 180-340 340.7 44.8 3.9 11-13 N 20R-1, 201-011 490.71 420-470 338.0 66.8 13.4 NPP 13R-2, 31-33 132-031 425.11 100-230 269.3 17.2 15R-4, 20.6 42-44 15R-5, 46-48 154-042 INT 155-046 447.52 449.06 240-470 230-60016R-2, 83-85 306.8 16R-3, 10-12 102.9 162-083 163-010 454.53 23.1 455.30 400-60018R-2, 8-10 180-42018R-3, 41-43 7.4 334.7 18R-4, 56-58 182-008 136.6 183-04118R-5, 16-18 N 472.98 184-056 474.81 185-016 200-440 47.5 476.46 200-420 477.56 170-560 122.2 2.7 250-420 93.4 106.4 149.9 N 7.6 6.0 NPP 11R-3, 77-79 113-077 412.47 140-260 150.4 63.4 7.7 15R-1, 56-58 N 151-056 443.16 140-360 186.4 48.1 5.3 N 19R-1, 47-49 191-047 481.47 240-470 304.5 section, interval section, Table T2 (continued). (continued). T2 Table in sampling gap 14-m Maastrichtian cyclic chalk green-gray Light 17-m gap in recovery 15-m gap in recovery chalk gray in cycles Red-pink Campanian chalkwithTan cyclic red-brown-green 8-m gap in recovery J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 41 Near slumped interval! C34n C34n C34n C34n C34n chron chron Polarity assignment Comments Polarity column rating Polarity 5.1 RP 6.0 7.2 RP 11.5 ? 1.5 INT 7.0 ? – – – 30.9 8.3 INT 12.6 1.5 R ? – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 22R-1, 26-28 221-026 510.06 200-420 285.7 21R-1, 14-17 211-014 500.34 280-470 40.5 23R-6, 66-68 236-066 40.0 527.56 3.9 140-440 356.7 N 47.2 4.0 N 30R-CC, 12-14 309-012 595.73 150-350 196.4 11.7 2.8 NP 20R-3, 12-14 203-012 493.6720R-4, 19-21 240-470 204-01983-85 106.8 495.2421R-5, 215-083 140-40092-94 28.2 507.0323R-1, 231-092 73.0 290-35023R-5, 123-125 2.6 520.32 235-123 121.7 100-20023R-7, 59-61 54.8 28.8 13.0 526.63 NPP N 24R-1, 135-137 180-420 237-059 14.8 241-135 30.7 26.9 17.5 NPP 24R-3, 14-17 528.99 530.45 338.4 NP 26R-1, 20-22 200-270 180-340 243-014 261-020 39.1 531.60 124.2 83.8 548.6026R-3, 135-137 200-420140-142 263-135 3.5 200-350 33.4 272-140 552.7527R-2, 48.5 560.90 203.5 N 140-560 9.9 100-32028R-3, 79-81 37.7 293.2 NPP 28R-4, 54-57 283-07928R-6, 117-119 0.5 3.5 284-054 33.7 23.028R-CC, 286-117 NPP 8-10 47.0 571.39 572.64 576.27 170-350 289-008 N 29R-1, 98-100 200-270 3.1 200-290 577.2929R-3, 15-17 291-098 220-34029R-4, 6.6 100-102 111.7 N 19.1 578.18 293-01530R-1, 294-100 29-3130R-2, 142-144 170-350 580.35 73.5 582.70 29.7 57.0 301-02930R-4, 302-142 84-86 47.9 200-330 140-32030R-5, 126-128 587.09 11.3 589.72 64.5 304-084 7.3 305-126 8.0 187.9 180-330 241.5 140-35031R-1, 120-122 592.14 NP 594.0631R-2, 311-121 122-123 26.7 N 203.5 140-440 300.2 240-330 N 31R-3, 312-122 40-42 30.5 33.6 597.6031R-4, 103-105 3.1 599.12 265.2 180-340 313-040 314-103 14.3 24.6 61.9 24.7 6.7 140-320 599.80 601.93 N 50.1 NP 64.5 8.9 1.9 270-360 28.0 N 125.7 100-480 10.3 176.6 N 183.4 N 5.5 42.5 NP 12.1 18.5 56.2 N NP 3.6 8.7 N N 24R-2, 35-38 242-035 530.95 150-400 179.2 42.6 5.8 N 20R-2, 67-69 202-067 492.77 230-520 355.3 68.4 4.2 N 26R-3, 38-40 263-038 551.78 180-470 283.7 42.3 2.4 N section, interval section, Dark gray silty nannoclaystone silty Dark gray Table T2 (continued). (continued). T2 Table Coniacian tan chalk Pinkish Turonian Brownish red marl Cenomanian chalk with light-dark cycles Light-gray Gray marly chalk Albian late Red marly interval (Sections 171B-1050C-26R-2,90 cm, through 26R-4,30cm) J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 42 each sample. Declinationeach sample. and inclination netic vectors to obtain the characteristic direction. The polar- des of gray or hatchure fill in the schematic column reflecting ignments are based on the polarity pattern and biostratigraphicignments pattern on the polarity are based h hole are on the associateddisplayed magnetostratigraphic fig- chron chron Polarity assignment Comments Polarity column rating Polarity Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) C) indicates the demagnetization range that was the demagnetization usedandC) indicates to compute polarity of magnetization the characteristic direction for ° Run Run name (cm) ure. The interval ( The ure. are in degrees. MAD (mean angular dispersion) values indicate the precision of the three-dimensional line fit of these paleomag line fit of the three-dimensional of the precision indicate values dispersion) angular MAD (mean in are degrees. columns polarity N) are is explained in the text. Two shown with the sha NP, N??, NPP, R??, INT, RPP, ity rating system (R, RP, main column polarity intervals. and the Polarity chron ass indicating samples the generalized rating of individual polarity the to constraints in correlating polarity magnetic the reference scale. time facies/Core, facies/Core, Position, age, 31R-5, 30-3231R-6, 70-72 315-030 316-070 602.70 604.60 180-340 150-450 118.1 186.8 33.4 49.9 4.2 6.4 N NP section, interval section, Table T2 (continued). (continued). T2 Table Notes: Sediment facies are generalized color-texture fromdescriptions shipboard observations, and the lithologic units for eac J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 43 Continuednext five on See table notes. See table C17n C17n C17n C18n chron chron C16r? assignment. zone polarity Uncertain Polarity C17n.2r? assignment Comments Polarity column rating Polarity 4.1 12.5 RP9.4 33.1 RPP C17n.1r? 2.7 17.4 R?? – – – 40.1 14.1 RPP 39.4 6.8 INT 38.7 5.0 R 27.921.6 24.2 RPP 6.651.039.7 R 4.7 6.2 RPP R 58.9 16.7 RP35.4 11.3 C17r RP 13.3 8.2 RPP 14.4 23.7 RPP – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name Characteristic directions and polarity ratings and polarity chron assignments, Hole 1051A. ( 1051A. Hole assignments, chron polarity and ratings polarity and directions Characteristic (cm) 2H-4, 30-32 024-030 10.60 140-300 119.3 10.0 37.8 NPP 6H-1, 32-34 061-030 44.12 180-270 208.1 5.8 21.7 NPP 2H-7, 31-33 027-030 14.613H-7, 30-32 240-270 97.1 041-032 24.60 300-340 294.7 58.06H-7, 30-32 10.2 NP 067-030 53.10 160-340 298.3 41.38H-7, 30-32 4.7 087-030 N 70.89 160-300 280.0 31.5 4.3 N 5H-1, 33-35 051-033 34.63 300-340 349.2 39.5 6.7 NP 2H-5, 21-233H-1, 30-32 025-0213H-3, 30-32 12.013H-4, 30-323H-6, 30-32 200-300 031-030 033-0304H-3, 31-33 137.7 15.60 034-0304H-5, 31-33 18.60 036-030 140-2704H-6, 30-32 20.10 210-240 48.8 23.10 043-031 303.7 140-3005H-2, 30-32 045-031 150-2005H-3, 30-32 44.4 28.11 8.1 046-030 228.9 5H-5, 30-33 48.9 31.11 287.0 200-3405H-6, 30-32 32.60 052-030 180-240 NP 37.05H-7, 30-32 053-030 183.4 140-300 9.1 35.0 36.10 055-030 172.2 15.86H-3, 30-32 37.60 056-030 240-3006H-4, 30-32 19.4 NP 41.7 40.60 31.1 057-030 200-300 NPP 41.2 42.10 355.9 160-3007H-1, 35-37 43.60 NPP 063-030 297.5 140-210 8.07H-2, 30-32 10.5 064-030 140-1807H-3, 30-32 13.9 48.6 47.10 31.0 N 55.1 48.60 NPP 071-035 140-300 86.2 072-030 150-300 70.1 6.87H-6, 30-32 53.65 12.4 073-030 38.17H-7, 30-32 55.10 2.1 160-240 14.3 10.9 NP 56.60 140-140 NP 7.78H-3, 30-32 076-030 270.9 140-350 NPP 43.38H-5, 30-32 077-030 118.6 45.6 61.10 INT 325.1 65.1 62.609H-3, 30-32 140-210 4.6 083-030 5.9 38.59H-4, 30-32 140-300 085-0309H-5, 20.3 30-32 114.7 64.89 N 9H-6, 30-32 NP 107.1 67.89 5.3 093-030 140-270 NPP 094-030 140-240 24.7 75.60 095-030 INT 293.7 44.410H-3, 30-32 77.10 096-030 302.2 200-27010H-5, 36.5 29-31 78.60 240-300 29.9 80.10 6.4 319.4 140-180 103-030 INT 48.8 335.4 180-300 105-029 14.8 201.0 N 85.10 29.1 13.9 312.2 88.09 240-270 NP 200-300 44.2 27.7 NP 274.1 286.7 16.4 NP INT 2H-3, 30-33 023-030 9.10 140-330 358.5 7H-4, 30-32 074-030 58.10 140-300 327.4 10H-1, 30-32 101-030 82.10 180-240 251.5 7H-5, 30-32 075-030 59.60 300-340 85.5 10H-2, 30-32 102-030 83.60 210-300 273.0 Position, age, facies/ age, Position, Core, section, interval section, Core, late Eocene late ooze-chalk Yellow-white 171B-1051A- Table T3. T3. Table Eocene middle ooze-chalkGreenish white pages). J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 44 ? C19n C20n C20n chron chron Polarity assignment Comments Polarity column rating Polarity 6.7 33.0 INT – 20.4 14.3 RP 18.4 12.8 RP 34.7 9.441.754.4 R 4.6 18.3 R 14.6 RPP 14.8 RPP C19r 32.2 4.5 R C18r 20.8 12.158.2 R 7.2 RP 52.4 8.8 RP 40.8 10.619.7 RP 15.0 RPP 32.8 9.0 RP 17.2 10.9 RPP 48.3 10.8 RP 57 4.7 R 46.7 4.1 R 18.1 10.2 RP 42.6 11.3 R 33.6 14.2 RP 33.6 14.0 RP 43.1 6.9 R – – – – – – – – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) 19X-6, 107-109 196-107 176.37 140-180 78.5 37.4 12.3 NPP 15H-3, 30-32 153-030 132.60 180-240 314.4 50.8 19.219X-3, 108-110 NP 193-108 171.88 180-240 169.3 36.923X-2, 128-130 30.5 232-128 NPP 208.98 180-290 273.5 35.4 28.1 NPP 10H-7, 17-19 107-017 90.97 180-240 319.1 15H-5, 30-32 155-030 135.6017X-1, 26-28 140-270 142.6 18X-1, 116-118 171-026 148.5618X-5, 134-137 181-116 140-30018X-6, 54-57 159.3619X-1, 115-117 185-134 306.3 150-250 165.5419X-, 4, 106-108 186-054 191-115 210-350 36.7 166.24 168.95 194-10620X-1, 103-105 140-180 340.4 180-29020X-3, 101-103 173.3620X-5, 142-144 201-103 140-24021X-1, 3-5 57.4 203-101 77.4 178.4321X-3, 108-110 205-142 325.0 181.41 180-25021X-5, 2-4 184.82 140-270 29.822X-1, 3-5 58.1 213-108 212.6 140-30022X-3, 132-134 211-003 191.08 223.2 35.1 187.03 6.6 100-20023X-6, 55-57 215-002 223-132 60.7 46.1 150-21024X-1, 47-49 221-003 NPP 193.02 51.4 200.92 186.124X-4, 115.5-117.5 N 196.63 180-240 10.7 244-115 180-27025X-1, 68.5-70.5 26.4 236-055 250-290 14.125X-5, 22-25 241-047 221.46 214.25 23.3 283.0 251-068 147.426X-1, 88-90 N 216.27 140-210 265.4 140-240 N?? 23.0 226.09 140-210 255-022 9.6 49.8 140-300 308.8 35.1 116.6 42.1 261-068 27.6 231.62 112.5 NPP 18.4 252.2 235.88 15.4 180-210 NPP 40.3 48.3 140-400 7.4 50.3 NPP 158.1 NP 47.6 12.2 16.6 NP 92.5 6.2 23.9 37.1 NPP NP 24.5 NP NPP 15.1 20.7 NPP NP 16H-1, 30-32 161-030 139.10 140-300 109.1 11H-3, 30-32 113-030 94.60 210-350 119.9 17X-3, 121-123 173-12118X-2, 42-44 152.51 150-320 182-042 80.1 160.12 100-300 125.2 51.0 30.3 R?? 11H-5, 30-32 115-030 97.60 180-240 103.0 16H-3, 31-33 163-03117X-5, 99-101 142.11 240-330 175-099 119.6 155.29 210-350 21.3 12H-1, 30-3212H-3, 29-31 121-030 123-029 101.10 104.09 180-240 200-300 201.4 230.4 17.2 17.1 INT 16H-5, 31-33 165-031 145.11 200-300 106.5 12H-4, 30-32 124-030 105.60 100-250 240.4 12H-5, 30-32 125-030 107.10 160-340 220.8 13H-2, 31-33 132-031 112.11 210-300 157.0 13H-3, 30-32 133-030 113.60 240-300 156.5 13H-5, 30-32 135-030 116.60 180-300 180.3 14H-1, 30-32 141-030 120.10 180-240 273.4 14H-3, 30-32 143-030 123.10 240-300 303.8 14H-5, 30-32 145-030 126.10 180-350 282.2 14H-7, 30-3215H-1, 30-32 147-030 151-030 129.10 129.60 140-180 180-350 0.1 303.2 22.7 66.3 22.8 7.0 INT N Position, age, facies/ age, Position, Core, section, interval section, Core, Table T3 (continued). (continued). T3 Table White chalk White J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 45 ? C20r C20r C21n C22n chron chron Polarity assignment Comments Polarity column rating Polarity 23.6 9.5 RP 22.5 7.6 RPP 29.4 7.4 RP 26.929.7 10.527.1 RP 9.1 9.4 RP RP 17.423.5 9.0 9.0 RPP RP 16.1 2.9 RP35.6 5.946.6 13.5 R RPP C21r! 49.4 1.9 RPP 38.331.8 19.6 RPP 5.1 R 32.1 13.5 RP 37.2 6.8 R C22r 33.9 17.9 RP 43.1 5.3 R 32.7 11.8 RPP 18.3 7.2 R 33.7 4.6 R 12.9 29.5 RPP 35 11.8 RP 31.8 7.0 R 37.9 19.0 RP 30.8 5.0 R 29.2 11.6 RP 30.4 6.4 RP – – – – – – – – – – – – – – – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) 28X-5, 42-44 285-042 260.62 180-250 315.9 38.9 27.7 NPP 39X-1, 19-22 391-019 360.29 140-400 159.142X-3, 14-16 40.2 423-014 7.4 393.04 NP 210-300 335.0 14.4 10.6 NPP 27X-5, 27-29 275-027 250.87 180-290 266.9 32X-3, 24-26 323-024 295.84 210-250 140.9 27X-7, 16-18 277-016 253.76 180-240 47.5 0.7 26.4 RPP 26X-3, 102-10426X-5, 57-59 263-102 239.02 265-057 140-27028X-1, 48-50 241.5728X-3, 36-38 180-250 98.928X-7, 4-6 281-048 182.2 283-036 254.6829X-3, 3-5 55.6 257.56 140-210 140-18030X-2, 116-118 287-004 13.5 242.0 263.24 293-003 NPP 76.9 303-116 180-300 266.83 27.0 276.06 217.2 180-270 140-270 29.8 25.132X-4, 33-35 258.9 209.3 32X-5, 24-26 31.8 NPP 324-033 N?? 325-024 297.43 298.84 250-300 270-350 12.5 324.1 38X-7, 2-439X-6, 117-11940X-3, 95-9740X-5, 6-8 387-002 396-11741X-1, 61-63 359.42 368.77 403-095 140-290 140-290 373.65 405-006 411-061 250.0 140-300 351.1 375.76 379.91 180-300 343.6 210-330 40.8 44.242X-5, 81-83 357.1 75.8 60.3 3.2 6.043X-7, 16-19 425-081 32.8 3.4 N 396.71 N 140-270 437-016 3.5 N 408.66 261.9 270-300 N 152.0 42X-1, 14-16 421-014 390.04 250-290 282.3 31.6 6.3 NP 33X-1, 23-25 331-023 302.43 180-250 48.1 27X-1, 56-58 271-056 245.16 140-18029X-1, 91-93 95.6 29X-5, 21-23 291-09130X-5, 24-26 264.71 295-021 140-300 270.01 305-024 353.9 180-290 279.64 143.8 140-290 5.0 252.5 11.5 R?? 43X-1, 58-60 431-058 400.08 180-290 246.6 31X-1, 10-12 311-010 283.10 180-240 234.3 33X-3, 24-26 333-024 305.44 140-300 15.4 43X-5, 58-61 435-058 406.08 180-300 283.0 31X-6, 145-147 316-145 291.95 210-290 223.3 33X-4, 45-47 334-045 307.15 200-400 293.8 32X-1, 19-21 321-019 292.79 270-350 206.4 34X-1, 20-22 341-020 312.00 210-330 201.1 34X-2, 73-75 342-073 314.03 180-290 326.6 35X-1, 21-23 351-021 321.71 180-240 43.8 36X-3, 101-103 363-101 335.11 140-290 279.4 37X-2, 21-23 372-021 342.41 210-300 288.4 37X-4, 130-132 374-130 346.50 180-300 132.7 38X-1, 19-21 381-019 350.59 140-330 75.3 40.8 8.4 N Position, age, facies/ age, Position, Core, section, interval section, Core, Table T3 (continued). (continued). T3 Table 10-m gap in recovery early Eocene chalk Greenish gray White limestoneWhite (contrasted to chalk above) J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 46 s ’ is either a persistent normal-polarity is ” INT ” - ” NPP “ interval implies it is C24r. it is interval implies assigned depth interval. overprint or an N-polarity subzone within polarity Zone C24r C24r Zone polarity within subzone or an N-polarity overprint (probably the former). This intervalof C24r reversed-polarity this within transition Zone CP9a-DP9b Nannofossil C24r C23n C24n chron chron C24r? Polarity Brief N in assignment Comments Polarity column rating Polarity 2 11.6 INT – 21.0 18.0 RPP 21.2 11.8 RP (cont.) 25.8 38.5 RP 21.4 9.335.9 RP 24.5 21.1 26.9 RP INT 35.523.5 8.6 4.2 RP 17.8 RP 14.6 RPP C24r 37.7 4.6 R 33.2 18.6 RPP 11.1 19.6 RPP – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) 53X-CC, 28-3054X-1, 6-8 539-028 495.73 541-006 140-270 495.76 123.9 160-310 14.2 6.9 28.3 45X-1, 24-26 451-024 418.94 140-250 356.647X-1, 29-31 59.3 471-029 438.19 10.0 180-250 NP 234.9 76.4 7.9 N?? 54X-4, 95-97 544-095 501.15 150-260 12.5 50X-CC, 23-25 509-023 467.15 230-230 309.4 13.8 25.2 NPP 50X-4, 30-32 504-030 465.00 140-300 201.3 66.0 25.7 NPP 44X-3, 58-60 443-058 412.68 210-300 117.7 39.8 16.1 NPP 44X-1, 22-2444X-5, 19-22 441-02245X-2, 129-131 409.32 445-019 180-210 452-129 415.29 421.49 232.4 140-400 180-33046X-5, 12-14 144.146X-7, 32-34 180.9 47X-5, 23-25 465-012 40.048X-1, 23-25 467-032 434.4248X-3, 39-41 437.62 18.1 140-18048X-5, 35-37 475-023 140-240 481-023 444.13 NPP 331.2 483-039 447.73 150-290 485-035 98.2 450.89 140-29049X-3, 29-31 72.1 453.85 281.6 180-210 167.6 190-260 40.350X-2, 31-33 20.2 128.6 493-023 45.5 342.0 14.2 42.8 NPP 459.89 502-031 17.5 6.6 230-320 NP 462.01 6.7 15.0 287.0 240-270 N 51X-1,27-29 NP RPP 288.6 51X-3, 30-32 511-02751X-5, 29-31 467.0751X-7, 29-31 160-16052X-1, 24-26 513-030 515-029 470.10 146.952X-5, 39-41 517-029 473.09 140-240 521-024 476.09 000-150 476.74 16.7 300-33053X-2, 7-10 525-039 7.5 280-31053X-4, 8-10 61.7 482.8953X-6, 4-6 3.1 98.1 172.6 150-290 532-007 9.3 59.5 INT 534-008 101.6 23.3 487.67 27.8 536-004 490.68 220-280 3.2 150-300 493.64 5.2 INT 194.6 NPP 260-290 330.5 NPP 330.0 71.0 63.9 24.4 1.0 INT NP LowermostCore 171B-1051A-50X overlaps uppermostCore 51x 45X-4, 33-3545X-6,67-69 46X-1, 16-18 454-033 456-067 423.53 461-016 426.87 140-180 428.46 140-270 195.2 180-290 154.4 152.6 49X-1, 5.5 25-27 14.9 5.7 4.3 491-02550X-1, 29-31 457.35 INT INT 180-21050X-3, 28-30 501-029 314.7 460.49 503-028 190-260 463.48 231.0 160-250 208.8 20.5 C23r 41.8 7.052X-3, 22-24 27.6 NP 52X-CC, 34-36 Need more samples tosupport C23r! NPP 53X-1, 33-36 523-022 529-034 479.72 200-250 486.32 531-033 150-250 486.43 101.0 180-240 162.4 266.9 3.8 23.4 26.8 9.1 R?? INT 46X-3, 34-36 463-034 431.64 180-300 111.1 48.2 14.8 NP Position, age, facies/ age, Position, Core, section, interval section, Core, Table T3 (continued). (continued). T3 Table chalk marly Greenish gray limestone and marl light-dark of Cycles in sampling gap 20-m J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 47 intervalmay be a pervasive overprint. ” NP within C26r. biostratigraphy (Zone CP4) suggests that the lower portion of the of portion lower that the suggests CP4) (Zone biostratigraphy “ Resolution and extent of polarity Zone C26n is uncertain. Nannofossil Nannofossil uncertain. is C26n Zone polarity of and extent Resolution uncertain. is C27n Zone polarity of and extent Resolution ? C24r C26r C26n lower chron chron C26r? C25n? Polarity assignment Comments Overprinted?interval is that this imply would P3a) (Zone foraminifer Planktonic Polarity column rating Polarity 4.6 5.4 INT 8.8 8.9 RPP 8.5 3.5 RPP – – – 28.4 6.8 R?? 2615.6 3.7 6.0 R R 39.220.2 15.321.5 28.1 RP 13.3 RPP RPP 21.5 3.9 R 15.8 26.2 RP C25r 15.4 15.5 RPP – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) 64X-CC, 34-36 649-034 591.87 160-310 239.1 8.5 15.4 N?? 57X-3, 23-25 573-023 527.73 180-300 81.0 18.2 5.3 NP 62X-1, 54-56 621-054 563.44 180-300 182.6 24.1 7.2 NP 66X-4, 32-34 664-032 606.32 220-280 212.7 33.4 21.1 NPP 61X-1, 29-31 611-029 556.69 150-320 115.2 52.2 12.4 NP 56X-5, 18-20 565-018 521.08 180-180 159.9 63X-5, 107-109 635-107 579.57 150-260 336.3 7.8 7.6 N?? 65X-CC, 28-30 659-028 601.55 140-240 294.2 20.5 33.1 R?? 60X-2, 92-94 602-092 555.72 180-330 266.5 28.2 16.9 NP 64X-6, 68-70 646-068 590.28 200-400 191.9 8.7 11.4 NPP 56X-7, 20-2257X-5, 13-15 567-020 524.10 150-290 575-01359X-1, 29-31 530.6359X-3, 7-9 37.7 230-32059X-5, 16-1859X-6, 145-147 591-029 331.2 60X-1, 37-39 543.99 593-007 595-016 596-145 150-320 546.77 549.86 552.65 601-037 140-180 290.0 220-280 180-330 553.6761X-2, 83-85 291.061X-4, 165.0 74-76 220-310 41.6 1.462X-3, 343.4 37-39 612-083 16.6 13.462X-5, 52-52 614-074 20.4 41.9 558.7362X-7, 44-46 561.64 17.6 18.8 270-330 623-037 3.4 25.1 R?? 160-31063X-3, 31-33 625-052 566.27 R?? INT 627-044 69.1 15.1 NPP 569.42 290.3 230-32063X-7, 30-32 571.84 240-270 633-031 R?? 180-300 55.3 46.664X-1, 14-16 41.2 575.81 138.9 637-03064X-2, 147-149 194.4 210-33064X-4, 78-80 7.0 581.80 19.9 23.3 641-014 642-147 210-270 2.7 6.7 NP NP 582.24 585.07 9.7 644-078 349.8 25.9 160-31065X-1, 37-39 210-300 587.3865X-2, 6-8 NPP INT 129.8 190-29065X-4, 10-12 160.465X-6, 54-56 651-037 237.2 592.17 30.0 652-006 3.5 654-010 150-350 656-05466X-1, 99-101 593.36 596.40 25.1 14.4 599.84 150-320 185.6 140-33066X-6, 6-8 220-250 NPP 661-099 R?? 67X-1, 13-15 219.6 194.6 33.6 602.49 293.7 150-320 25.5 666-006 19.0 671-013 10.0 265.8 609.06 611.23 27.0 20.5 NP 230-260 220-250 15.7 NPP N?? 132.2 13.9 11.9 69.7 53.3 NPP 24.1 18.3 NPP NPP 56X-3, 12-14 563-012 518.02 160-310 22.7 57X-1, 23-2558X-1, 31-33 571-023 524.73 220-280 581-031 534.41 172.2 160-310 64.1 312.0 7.5 N 63X-1, 30-32 631-030 572.80 220-310 159.9 20.9 16.5 N?? 58X-3, 9-11 583-009 537.19 240-300 141.8 58X-5, 8-10 585-008 540.18 150-320 303.4 Position, age, facies/ age, Position, Core, section, interval section, Core, Table T3 (continued). (continued). T3 Table Paleocene late Pale green chalk chalk marly Dark gray early Paleocene J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 48 s s ’ ’ -dominated ” NPP “ suspicious. Inverted core catcher? core Inverted suspicious. → each sample. Declinationeach sample. and inclination netic vectors to obtain the characteristic direction. The polar- assigned depth interval. assigned depth interval. interval may be pervasive overprint on reversed-polarity Zone C27r. reversed-polarity on pervasivebe overprint interval may des of gray or hatchure fill in the schematic column reflecting LowermostCore 171B-1051A-69X overlaps uppermostCore 69x ignments are based on the polarity pattern and biostratigraphicignments pattern on the polarity are based h hole are on the associateddisplayed magnetostratigraphic fig- ? ? LowermostCore 171B-1051A-72X overlaps uppermostCore 73x C27n chron chron Polarity ? C27r ? Planktonic foraminifer (Zone P1c) suggeststhatthis assignment Comments Polarity column rating Polarity 73.3 20.9 INT UP steep is inclination NRM – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name C) indicates the demagnetization range that was the demagnetization usedandC) indicates to compute polarity of magnetization the characteristic direction for ° (cm) ure. The interval ( The ure. are in degrees. MAD (mean angular dispersion) values indicate the precision of the three-dimensional line fit of these paleomag line fit of the three-dimensional of the precision indicate values dispersion) angular MAD (mean in are degrees. columns polarity N) are is explained in the text. Two shown with the sha NP, N??, NPP, R??, INT, RPP, ity rating system (R, RP, main column polarity intervals. and the Polarity chron ass indicating samples the generalized rating of individual polarity the to constraints in correlating polarity magnetic the reference scale. time 68X-CC, 3-5 691-001 624.39 150-230 251.9 74.9 10.0 NP 72X-1, 6-9 721-006 640.06 150-260 213.0 32.0 15.4 NPP 72X-2, 44-47 722-044 641.94 180-330 224.7 45.0 7.3 N 71X-CC, 4-6 719-004 634.54 210-300 163.4 19.3 10.7 NPP 73X-2, 8-10 732-008 643.18 190-320 358.1 26.9 13.7 NPP 68X-2, 92-94 682-092 623.12 160-310 130.7 64.1 27.0 NPP 67X-4, 2-467X-CC, 39-4168X-1, 107-109 679-03969X-1, 1-3 674-022 681-107 619.88 615.62 621.77 150-290 180-30070X-1, 33-36 150-40070X-CC, 27-29 689-003 123.9 194.4 3.4 624.31 701-033 709-027 210-330 52.2 630.73 42.3 40.8 631.0673X-1, 16-18 188.5 220-280 180-330 15.1 10.8 21.7 351.572X-CC, 5-7 47.1 731-016 61.5 NPP NPP N 641.76 79.4 16.773X-CC, 12-14 150-450 729-005 NPP 7.4 642.32 156.7 739-012 220-280 NPP 643.87 38.2 219.1 210-300 250.7 5.3 55.1 N 11.0 9.0 NPP 14.6 N?? Position, age, facies/ age, Position, Core, section, interval section, Core, Light gray limestone Light Table T3 (continued). (continued). T3 Table Notes: Sediment facies are generalized color-texture fromdescriptions shipboard observations, and the lithologic units for eac J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 49 zone. ” C17n.1r Continued on next five pag- “ polarity zone. polarity See table notes. ” R?? “ C16n C16n C17n C17n C17n chron chron Polarity C16n.1r? this displayed also data magnetometer cryogenic pass-through Shipboard C17n.1r? lower of this validity Uncertain C17n.2r? assignment Comments Polarity column rating Polarity 13.6 34.3 R?? 19.5 RPP 47.452.0 27.231.7 29.0 RPP 34.7 INT INT 48.7 33.0 C16r RP16.8 8.7 INT 31.236.7 C17n.1r 8.439.635.3 11.857.8 R 6.4 RP 6.5 6.2 R R R C17r – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name Characteristic directions and polarity ratings and polarity chron assignments, Site 1052. ( 1052. Site assignments, chron polarity and ratings polarity and directions Characteristic (cm) (cm) facies/Core, Position, age, 10H-5, 31-32 105-031 86.01 180-270 235.5 38.2 8.1 N 3H-5, 31-33 035-031 19.51 180-2404H-7, 31-33 191.5 047-031 32.01 26.2 140-240 25.2 290.2 NPP 47.57H-5, 30-32 14.6 075-030 NPP 57.50 140-270 269.1 73.810H-2, 26.4 31-33 102-031 NP 81.5111H-2, 31-33 180-350 112-031 201.4 91.01 41.3 140-240 22.0 170.6 NP 4H-2, 30-32 042-030 24.50 200-400 275.3 59.5 8.9 N 9H-5, 30-32 095-030 76.50 140-180 49.4 41.6 14.7 NPP 5H-6, 30-326H-3, 30-32 056-030 40.00 063-030 180-240 45.00 259.3 140-350 72.4 11.59H-3, 30-32 23.4 75.7 093-030 R?? 31.6 73.50 N?? 140-240 261.4 50.4 38.711H-4, 31-3311H-5, 31-33 NPP 11H-7, 30-32 114-03112H-1, 45-47 115-031 94.0112H-2, 31-33 117-030 95.5112H-3, 31-33 121-045 140-350 98.50 122-033 140-240 99.15 123-031 199.2 180-400 100.51 197.8 180-350 102.01 180-300 203.6 140-140 46.2 351.7 311.9 244.7 39.5 RP 83.1 3.4 INT 3H,30-32 3, 3H-6, 30-32 033-030 16.50 036-0304H-3, 30-32 140-2104H-5, 31-33 21.00 043-030 152.6 140-1405H-1, 30-32 045-0315H-3, 30-32 26.00 279.2 5H-4, 30-32 24.0 29.01 051-030 180-4005H-5, 30-32 053-030 140-270 11.2 32.50 054-030 294.46H-2, 30-32 35.50 055-030 318.3 140-240 37.00 NP 140-2106H-5, 30-32 47.8 38.50 062-030 299.8 140-2407H-1, 30-33 33.7 345.6 140-2707H-3, 30-32 43.50 065-030 9.8 73.1 57.4 071-030 197.6 100-350 9.08H-1, 30-32 77.1 48.00 073-0308H-3, 44-46 N 51.50 36.6 182.8 140-3008H-5, 30-32 NP 54.50 11.2 081-030 140-2709H-1, 35-37 NPP 083-044 178.2 140-4009H-2, 30-32 61.00 NPP 085-030 237.4 64.14 091-035 268.3 180-2709H-4, 30-32 71.0 67.00 092-030 140-350 56.5 70.55 177.0 180-3009H-6, 30-32 62.0 72.00 47.4 094-030 174.5 140-270 33.3 185.8 140-270 43.0 75.00 19.6 096-030 N?? 67.9 18.4 NPP 304.3 140-270 43.7 78.0010H-3, 30.6 30-32 NP 10H-4, 29.3 30-32 255.0 140-300 72.0 17.3 NPP 103-03011H-1, 30-32 104-030 INT 117.9 15.1 47.4 83.00 NP 84.5011H-3, 31-33 111-030 140-240 NPP 44.1 40.4 140-140 89.50 113-031 161.8 RPP 221.3 140-300 7.8 92.51 180-300 37.6 30.1 N 210.6 51.4 5.3 10.2 INT NP 10H-1, 62-64 101-062 80.32 140-240 214.8 30.3 11.2 NP 3H-2, 30-32 032-030 15.00 100-200 116.0 51.9 18.6 N?? section, interval Table T4. T4. Table Eocene middle es.) late Eocene late 171B-1052A- J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 50 zone is Chron C27n. Chron is zone even though assigned meter levels overlap. Core 171B-1052A-20X is a reversed-polarity zone, and biostratigraphy C26r. Chron it is implies ? C27r C26r uppermost indicates magnetometer cryogenic pass-through Shipboard C18n C19n C27n that this normal-polarity imply CP3) (mid-Zone nannofossils Calcareous chron chron C27n? m 2 added toavoid overlap with Core 171B-1052A-19X. Polarity assignment Comments Polarity column rating Polarity 22.7 21.4 RPP 46.332.951.3 10.2 7.1 3.1 R R R C18r 26.4 25.6 RPP 44.912.0 21.729.023.0 23.0 RPP 74.4 19.5 INT 3.9 20.2 RPP RP RPP C27r 17.8 2.5 R C26r Core 171B-1052E-3Ris paleontologically belowCore 171B-1052A-19X, – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) (cm) facies/Core, Position, age, 8R-4, 27-298R-CC, 7-9 084-027 089-007 208.77 180-180 210.32 170-200 271.7 123.9 1.4 4.6 INT 14H-1, 30-32 141-030 118.00 210-350 5.4 55.3 101-10319X-6, 9.219X-CC, 15-17 196-101 163.81 199-015 N 260-380 164.14 350-550 2.6 161.1 12.9 2.3 4.6 4.6 R R?? C19r 17X-2, 57-5918X-1, 127-12918X-CC, 14-16 172-057 181-12719X-1, 15-17 189-014 138.07 146.97 210-350 140-400 154.74 191-015 000-400 155.45 338.1 118.8 180-300 22.6 36.0 -0.9 26.9 2.6 1.7 INT N 10R-2, 133-135 102-13310R-4, 121-123 226.03 104-121 220-300 228.91 150-260 24.5 73.0 12H-5, 30-3213H-1, 32-3413H-3, 31-33 125-03013H-5, 32-34 131-032 105.0013H-6, 32-34 133-031 108.52 180-400 135-032 111.51 140-35014H-3, 30-32 136-032 114.52 194.5 140-35014H-5, 30-32 116.02 140-30015H-1, 69-71 143-030 49.0 150-30015H-2, 30-32 145-030 34.9 45.9 121.0016X-1, 72-74 151-069 37.4 124.00 140-270 41.016X-3, 146-148 152-030 43.7 127.89 140-350 50.4 6.8 161-072 163-146 129.00 210-300 49.9 7.0 130.42 6.5 134.16 140-270 53.7 61.5 NP 7.5 348.7 140-350 140-300 3.6 322.2 N 12.919X-4, 25-27 60.5 331.0 N 57.2 205.1 65.8 N 194-025 NP 59.1 7.2 6.4 54.1 160.05 6.4 180-300 6.0 N N 5.9 N 10.8 N N 23.3 2.7 N 6R-CC, 3-58R-1, 23-25 063-0038R-2, 26-28 185.33 081-023 170-230 082-0269R-1, 23-26 204.23 269.3 9R-CC, 12-14 205.76 150-23010R-1, 116-118 100-200 091-023 099-012 101-116 71.210R-3, 2-4 213.83 215.92 89.0 224.36 100-230 150-230 100-170 15.8 103-002 46.9 355.4 32.9 225.4 226.22 17.5 17.5 100-170 50.4 INT NPP 33.9 20.2 INT 20X-CC, 24-26 209-024 165.37 270-330 135.7 28.7 12.9 NP 3R-CC, 6-8 039-006 159.405R-1, 32-34 150-290 051-032 310.4 175.52 180-220 71.8 64.2 6.2 N section, interval Table T4 (continued). (continued). T4 Table Paleocene Paleocene late 171B-1052E- 15-m gap in recovery early Paleocene 10-m gap in recovery 20-m gap in recovery J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 51 recovery. Apparently, reversed-polarity Chron C28r was not resolved or is absent in or is resolved notwas Chron C28r reversed-polarity Apparently, ? Slump. ? C28n C29n C30n C31n C31n chron chron C30r? Polarity assignment Comments Polarity column rating Polarity 1.8 31.1 INT – 22.726.345.7 20.3 19.829.4 16.2 RP 32.3 RPP 41.5 RP 6.4 4.9 3.1 R R R 69.4 14.3 RPP 11.5 25.6 R?? 32.1 26.7 RPP – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) (cm) facies/Core, Position, age, 22R-3, 23-2522R-4, 58-60 223-023 224-058 341.83 343.68 140-210 140-200 15.6 306.8 63.3 12.3 19.0 22.8 INT R?? 24R-4, 8-11 244-008 362.28 140-210 340.7 48.2 19.7 NPP 17R-2, 141-14317R-2, 172-141 293.28 140-320 9.9 43.720R-7, 59-61 7.7 207-059 N 328.89 180-270 336.8 38.723R-3, 61-63 19.2 233-061 351.91 NPP 140-180 342.1 61.0 8.2 NP 24R-1, 7-9 241-007 357.97 190-260 138.3 31.8 30.6 NPP 16R-1, 70-72 161-070 281.60 150-320 65-67 342.117R-4, 174-065 40.2 295.52 260-340 5.2 1.1 N 35.921R-1, 70-72 9.3 211-070 329.60 NP 100-200 355.5 44.223R-4, 69-71 39.1 234-069 353.49 N?? 140-240 179.3 11R-1, 21-23 50-5212R-1, 111-02112R-2, 106-108 233.0112R-4, 108-110 121-050 122-106 180-30013R-1, 40-42 124-108 242.90 244.9613R-2, 57-59 100-200 247.77 269.5 150-290 131-040 150-400 132-057 292.9 252.40 326.5 254.07 140-420 279.3 180-260 6.4 207.4 356.5 20.6 21.4 INT 14.4 NPP 10R-6, 47-4911R-2, 29-31 106-047 230.67 112-029 140-230 234.59 221.9 140-20013R-3, 59-61 316.6 45-4714R-1, 15R-1, 61-63 133-05915R-CC, 19-21 141-045 255.59 151-061 262.15 159-019 140-23016R-3, 34-36 150-320 271.9116R-4, 68-70 274.11 300.4 180-38016R-6, 45-47 163-034 100-17017R-1, 79-81 164-068 4.5 284.24 195.4 166-045 328.9 35.7 286.04 200-400 171-079 288.81 260-340 31.9 48.1 291.29 11.5 168.517R-6, 140-350 139-141 41.3 205.1 290-320 176-137 3.8 204.0 NP 12.4 6.7 45.5 299.24 235.9 100-230 N 2.3 NPP N 64.4 14.520R-2, 46-48 43.720R-3, 60-62 12.5 68.3 10.220R-5, 47-49 202-046 N 10.320R-6, 48-50 203-060 NPP 321.26 NP 205-047 36.3 322.90 100-140 NP 206-048 325.77 140-210 142-14421R-2, 24.4 327.28 313.4 140-30021R-3, 145-147 212-142 321.9 230-26021R-4, 86-88 213-145 331.82 NP 21R-5, 72-74 73.0 43.9 140-210 333.35 302.4 22R-1, 11-13 214-086 37.3 180-270 215-072 334.26 13.9 42.3 29.3 221-011 335.62 23.0 140-21023R-1, 339.5 100-102 338.71 NPP 100-200 19.9 231-100 NPP 306.5 260-290 8.4 35.4 349.30 318.4 NPP 213.5 24R-2, 260-290 4-7 12.1 50.1 21.324R-3, 31-33 27.7 136.4 N?? 24.4 NPP 25R-1, 27-29 242-004 243-031 19.525R-1, 99-102 359.44 361.21 25.7 NPP 26R-1, 13-15 251-027 NPP 251-049 200-400 140-210 367.77 28.3 368.49 261-013 298.8 100-170 66.9 140-210 377.23 NPP 255.3 140-300 169.8 26.1 26.4 29.0 17.4 50.1 22.1 37.4 NPP 35.5 INT 17.5 NPP NP 20R-1, 64-66 201-064 319.94 140-210 345.6 34.2 40.8 NPP section, interval Table T4 (continued). (continued). T4 Table magnetometer. pass-through in shipboard resolved C29r Zone polarity in sampling; gap 20-m Maastrichtian J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 52 C31r C34n chron chron Polarity assignment Comments Polarity column rating Polarity 0.9 18.49.4 INT 18.5 RPP 8.4 26.4 RPP – – – 42.822.8 20.6 2.0 RP RPP 16.922.853.5 25.951.6 13.559.7 11.7 RPP 38.9 15.9 RPP 24.9 27.5 RPP 59.8 26.8 RPP 26.4 RPP 25.6 12.6 RPP 10.2 RP 16.4 RPP 7.6 RPP 34.9 RPP 23.232.7 40.421.7 20.420.9 14.1 RPP 11.4 RP 8.634.1 14.3 RPP 37.8 14.4 RPP 11.7 20.2 RPP 45.8 27.1 RPP 12.8 23.0 RPP 67.8 15.3 RPP 16.6 RPP 8.542.7 25.9 RPP 9.6 RPP 28.7 RPP 68.5 RPP RP 39.5 RPP – – – – – – – – – – – – – – – – – – – – – – – – – – – 413 38.9 RPP – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) (cm) facies/Core, Position, age, 38R-2, 26-28 382-026 494.16 180-260 36.6 21.2 7.6 NP 30R-3, 59-61 303-059 419.09 230-320 16.9 30R-4, 25-27 304-025 420.25 170-200 246.2 28R-3, 59-6129R-3, 25-27 283-059 399.89 293-025 140-210 409.15 190-230 85.5 218.3 31R-1, 29-31 311-029 425.39 150-200 350.4 35R-2, 28-30 352-028 465.38 100-140 25.6 26R-2, 131-13426R-3, 45-47 262-13126R-4, 99-102 379.9126R-5, 44-46 263-045 264-09926R-6, 150-260 66-68 380.5526R-7, 16-18 382.59 265-044 170-20026R-CC, 7-9 266-066 46.4 140-180 383.5427R-1, 87-89 267-016 385.26 172.1 100-20027R-5, 85-87 116.0 269-007 386.26 140-18027R-6, 4-6 38.9 271-087 100-170 386.7327R-CC, 9-11 275-085 97.6 55.2 387.5728R-1, 32-34 150-260 38.2 23.4 26.1 393.55 319.7 210-24028R-2, 57-59 279-009 276-004 180-210 62.3 8.6 100.2 281-032 21.0 NPP 395.30 394.24 116.2 27-2929R-1, 22.6 282-057 63.7 396.62 290-320 170-200 189.8 16.0 NPP NPP 398.37 140-21029R-5, 69-71 291-027 35.8 32.0 284.0 222.3 140-21030R-1, 30-32 NPP 406.17 295-064 N?? 14.1 210-240 N?? 301-030 97.5 412.5930R-5, 47-49 415.80 180-21030R-6, 31-33 7.0 140-240 305-047 327.0 31R-2, 64-66 306-031 421.9731R-3, 32-34 44.3 423.31 210-24031R-4, 24-26 312-064 180-24031R-5, 30-32 313-032 427.2431R-6, 20-22 314-024 17.8 428.42 140-20031R-7, 30-32 315-030 51.5 429.84 250-25033R-1, 46-48 316-020 431.40 190-26033R-CC, 4-6 317-030 64.3 432.80 180-24034R-1, 31-33 331-046 67.1 434.40 210-24034R-2, 30-32 90.8 339-004 444.76 346.0 100-17035R-1, 47-49 341-031 180-180 445.84 342-030 90.0 454.21 359.0 33-3535R-3, 170-170 351-047 455.70 118.0 190-32035R-4, 13-15 464.07 100-100 353-033 48.6 222.8 140-210 354-013 466.93 10.7 36R-6, 127-129 140-210 468.23 79.9 37R-3, 51.5-54 366-127 140-20037R-6, 84-86 373-051 481.97 2.8 339.6 38R-6, 485.83 200-300 19-21 376-08439R-1, 76-78 200-300 490.6539R-6, 175.5 114-116 386-019 150-500 391-076 396-114 500.09 39.3 502.76 46.7 510.14 172.3 140-380 140-320 200-330 41.0 12.2 311.1 38.7 307.6 228.9 10.1 NP 51.8 3.8 50.4 40.8 N 5.7 N 15.2 5.0 N NP N 36R-4, 64.5-66.536R-4, 364-064 478.35 180-260 0.3 45.1 12.2 NP section, interval Table T4 (continued). (continued). T4 Table early Cenomanian J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 53 C34n chron chron Polarity assignment Comments Polarity column rating Polarity Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) (cm) facies/Core, Position, age, 49R-5, 97-99 495-097 604.27 140-350 246.7 36.5 7.6 N 42R-1, 46-4842R-5, 72.5-7543R-2, 58-60 421-046 425-07343R-4, 87-89 530.3644R-1, 536.63 26-28 432-058 260-38044R-6, 23-25 434-087 140-420 541.5246R-5, 146-148 441-026 544.81 101.2 220-30047R-1, 30-32 446-023 465-146 549.36 53.2 140-35047R-3, 16-19 556.83 575.22 175.9 270-36047R-5, 29-31 471-030 40.8 151.9 170-23047R-7, 180-300 18-20 473-016 41.0 578.3048R-1, 37-39 475-029 48.9 45.8 581.16 200-36048R-3, 140.0 35-37 5.3 477-018 18.4 44.5 584.29 3.3 200-32048R-5, 27-29 481-037 587.18 355.4 260-30048R-7, 30-32 35.6 7.8 483-035 NP 587.97 33.0 301.6 200-29049R-1, 30-32 46.8 3.2 485-027 N 590.95 182.4 240-36049R-3, 72-74 12.8 487-030 N 44.6 593.87 232.2 140-260 491-030 4.1 8.8 N 24.8 596.90 118.3 220-30050R-1, 144-146 493-072 NP 65.7 597.60 211.2 200-29050R-2, 94-96 5.8 501-144 NP 22.8 601.02 11.7 NP 247.3 140-35050R-3, 14-16 33.5 18.3 608.34 165.0 180-30051R-1, 143-145 502-094 N 28.6 343.151R-2, 140-250 40-42 3.3 N 503-014 511-143 33.5 609.34 NPP 278.351R-2, 81-83 8.2 33.2 610.04 618.03 240-33052R-1, 110.3 20-22 8.0 512-040 N 34.0 200-38052R-2, 180-300 106-108 8.7 512-081 N 39.0 618.50 351.952R-3, 119-121 8.1 521-020 522-106 N 618.91 38.7 195.8 140-30052R-4, 245.7 119-121 4.3 523-119 NP 621.90 11.8 624.26 200-330 21-2353R-1, 524-119 N 39.1 625.89 282.0 180-26053R-2, 170-290 141-143 3.7 N 40.1 46.7 627.3953R-3, 200-330 32-34 531-021 N 16.2 532-141 300.6 140-14153R-5, 227.5 230-320 6.6 627.41 NP 67.7 630.11 10.3 40-4253R-6, 8.9 535-140 533-032 91.3 180-34054R-1, 257.7 140-320 9-11 52.6 NP 634.60 38.4 630.52 44.454R-2, 3-5 536-040 5.6 N N 200-270 180-30054R-2, 214.5 138-140 46.3 6.2 635.10 3.9 541-009 66.255R-1, 56-58 5.9 NPP 5.6 542-138 170-290 342.355R-2, 46-48 636.89 542-003 15.4 7.8 32.0 639.68 15.155R-3, 49-51 33.9 N 551-056 140-320 NP 638.33 N 55R-4, 170-350 66-68 552-046 NPP 9.0 45.8 646.96 220-300 17.7 NPP 55R-5, 81-83 54.8 553-049 111.1 4.5 648.36 180-30055R-6, 127.8 8-10 554-066 649.89 115.6 170-38055R-7, 16-18 32.6 NP 6.2 555-081 1.9 651.56 298.4 200-330 N 57R-1, 50-52 32.7 556-008 653.21 29.7 336.7 100-32057R-2, 140-142 13.1 557-016 43.9 N NP 339.9 180-26057R-3, 144-146 653.98 571-050 572-140 2.8 42.0 655.56 10.3 329.7 NP 573-144 140-290 34.6 666.10 668.01 290.5 180-300 8.1 40.6 669.55 100-290 180-340 N NP 9.9 339.0 28.6 16.1 200-300 NP 86.7 24.2 238.1 275.0 8.8 N NP 335.8 29.3 8.8 11.7 38.0 N 51.8 37.3 3.3 N 41.9 NPP 8.8 16.1 8.2 N 2.7 NPP N NP NP section, interval Table T4 (continued). (continued). T4 Table Albian late J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 54 each sample. Declinationeach sample. and inclination netic vectors to obtain the characteristic direction. The polar- des of gray or hatchure fill in the schematic column reflecting ignments are based on the polarity pattern and biostratigraphicignments pattern on the polarity are based h hole are on the associateddisplayed magnetostratigraphic fig- chron chron Polarity assignment Comments Polarity column rating Polarity Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) C) indicates the demagnetization range that was the demagnetization usedandC) indicates to compute polarity of magnetization the characteristic direction for ° Run Run name (cm) (cm) ure. The interval ( The ure. are in degrees. MAD (mean angular dispersion) values indicate the precision of the three-dimensional line fit of these paleomag line fit of the three-dimensional of the precision indicate values dispersion) angular MAD (mean in are degrees. columns polarity N) are is explained in the text. Two shown with the sha NP, N??, NPP, R??, INT, RPP, ity rating system (R, RP, main column polarity intervals. and the Polarity chron ass indicating samples the generalized rating of individual polarity the to constraints in correlating polarity magnetic the reference scale. time facies/Core, Position, age, 57R-4, 120-12257R-5, 142-144 574-12057R-6, 132-135 575-142 670.8157R-CC, 6-8 576-132 672.5358R-1, 200-270 43.5-45.5 673.93 581-04458R-2, 140-260 116-118 579-00658R-3, 318.2 180-300 49-51 582-116 675.64 675.3158R-4, 283.8 20.5-22.5 200-290 677.84 584-020 20.5-2358R-5, 269.5 200-320 583-049 38.8 180-300 679.89 585-021 182.4 678.67 34.0 56.7 180-300 42.8 681.39 150-350 192.6 7.5 140-350 5.3 26.9 91.2 6.8 38.3 95.9 NP 22.8 9.1 N 3.8 10.9 N 29.8 26.5 5.7 NP 28.4 N 7.5 NP 9.1 4.0 N NP N section, interval Table T4 (continued). (continued). T4 Table Notes: Sediment facies are generalized color-texture fromdescriptions shipboard observations, and the lithologic units for eac J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 55 based on shipboard Initial Reports Continued on next two , but biostratigraphy, but C15r. also allows in ” C15r “ Initial Reports in ” C13r “ See table notes. interval is C15r). interval is simple means,simple rather than three-dimensional line fits. Alternatively, it could be Subchron C16n.1r within C16n. within C16n.1r be Subchron it could Alternatively, pass-through magnetometer probably butan artifact is of weak magnetics. Samplingof Cores 171B-1053A-6H through 9Hlater was a addition. In thesecores,fourthecharacteristic direction estimates were computedas ? assigned Was ? this interval could be resolved poorly C15n (if underlying Alternatively, C16n chron chron C13r? this interval could be lower C15r. Alternatively, C15n? Alternatively, this interval could be upper C16n. Polarity assignment Comments Polarity column rating Polarity 39.242.4 38.4 28.4 INT R?? 54.744.251 3.360.8 5.9 R 2.1 8.6 R R R C13r this interval Alternatively, could be upper C15r. 16.6 8.9 R 21.816.0 21.3 24.2 RPP 46.5 RP 31.7 INT 31.0 6.7 INT54.5 9.4 R ? This intervalwas assigned as C16n.1r winnowing. by reduced be may C15r Zone polarity possible This 34.838 5.1 5.9 R RP C13r? – – – – – – – – – – – – – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name Characteristic directions and polarity ratings and polarity chron assignments, Hole 1053A. ( Hole andCharacteristic 1053A. and chron assignments, polarity directions ratings polarity (cm) facies/Core, facies/Core, Position, age, 6H-2, 30-31 062-031 49.80 140-180 316.1 50.4 6.1 N 5H-1, 92-94 051-092 38.92 140-210 146.5 46.4 32.4 NPP 3H-5, 31-33 035-031 25.31 150-210 222.7 30.9 29.2 R?? 2H-6, 30-323H-1, 30-323H-3, 30-32 026-030 031-030 17.30 033-030 19.30 180-210 22.30 240-270 140-210 42.5 93.9 80.7 69.2 22.7 INT 1H-4, 30-331H-5, 31-331H-6, 30-33 014-0301H-7, 24-27 015-0312H-1, 30-32 016-030 4.80 017-024 6.31 150-480 021-030 7.80 150-480 9.24 183.6 150-550 9.80 184.6 140-400 184.9 150-480 201.2 80.4 54.3 9.6 N 6H-3, 30-31 063-031 51.30 140-180 97.5 60.5 3.9 N 6H-7, 30-31 067-031 57.30 140-180 99.0 40.9 13.7 NP 2H-2, 30-322H-4, 30-32 022-0302H-5, 30-32 11.30 024-030 025-030 150-480 14.30 15.80 100.3 140-1803H-4, 30-32 150-180 184.03H-7, 28-30 034-030 176.74H-2, 30-32 23.80 26.7 037-0284H-4, 30-32 54.2 000-1804H-5, 30-32 28.28 042-030 10.04H-6, 30-32 044-030 10.1 207.9 180-270 30.30 045-030 INT 5H-2, 28-30 33.30 046-030 116.3 N?? 150-2405H-3, 30-32 34.80 140-2105H-5, 30-32 36.30 052-028 150-240 27.2 053-030 313.5 150-270 39.78 055-030 203.5 41.30 180-210 27.6 19.9 43.30 150-240 28.3 176.6 140-140 33.7 203.7 68.5 30.5 NPP 6H-4, 30-31 65.2 68.7 26.06H-5, 30-31 62.9 INT 6H-6, 30-31 064-031 1.2 NPP 065-031 5.5 52.80 066-0317H-1, 30-31 NPP 54.30 180-2107H-2, 30-31 55.80 NP 140-1807H-3, 30-31 071-031 260.0 180-2407H-4, 30-31 072-031 252.87H-5, 30-31 57.90 073-031 178.1 59.40 53.4 074-031 100-140 60.90 60.4 075-031 100-140 62.40 21.8 198.8 100-140 63.90 11.8 100-140 91.1 292.3 140-140 NP 82.7 247.4 N 288.6 37.1 58.4 3.7 75.9 18.3 54.7 2.7 N?? 6.9 NPP 1.3 N N?? NPP 2H-3, 30-32 023-030 12.80 150-480 319.74H-1, 30-32 72.8 041-030 8.6 28.80 N?? 180-210 32.6 71.7 33.0 NPP 1H-2, 29-321H-3, 30-33 012-029 013-030 1.79 3.30 150-200 240-400 163.5 359.9 42.0 4.3 N 1H-1, 30-32 011-030 0.30 150-270 158.8 5H-6, 31-336H-1, 30-31 056-031 061-031 45.81 48.30 150-180 180-210 343.3 136.9 79.2 66.4 32.7 9.9 INT NPP section, interval section, Table T5. T5. Table pages.) late Eocene late 171B-1053A- J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 56 because of pervasive overprints or is absent. or of overprints pervasive because Alternatively, it may be a condensed C16r. polarity Zone a it may be Alternatively, Biostratigraphy suggests that polarity Zone C16r is either unresolved unresolved either is C16r Zone that polarity suggests Biostratigraphy chron chron C17n? C17n? C17n? Polarity assignment Comments Subchron in Polarity column rating Polarity 53.2 23.1 RP – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) Run Run name (cm) facies/Core, facies/Core, Position, age, 17X-3, 36-38 173-036 148.06 140-180 273.3 21.8 15.0 NPP 9H-5, 30-31 095-031 83.10 100-180 232.9 61.5 7.212H-4, 30-32 N 124-030 109.30 150-240 157.1 37.1 N?? 8H-6, 30-31 086-031 75.00 100-140 201.2 47.0 4.8 N 7H-6, 30-317H-7, 30-318H-1, 30-31 076-0318H-2, 30-31 077-0318H-3, 30-31 65.40 081-0318H-4, 30-31 66.90 082-031 100-2108H-5, 30-31 67.50 083-031 100-180 69.00 084-031 112.3 100-180 70.50 085-031 189.6 140-2108H-7, 30-31 72.00 163.8 140-1809H-1, 30-31 47.3 73.50 280.6 100-2109H-2, 30-31 77.0 087-031 109.7 100-1009H-3, 30-31 45.8 091-031 10.4 192.09H-4, 30-31 76.50 73.3 092-031 139.7 6.1 77.10 42.3 093-031 10.1 140-240 N 9H-6, 30-31 78.60 65.7 094-031 10.4 140-180 N?? 9H-7, 30-31 80.10 26.3 28.8 224.4 100-180 N 10H-1, 30-32 81.60 096-031 NPP 107.5 140-240 9.910H-4, 31-33 097-031 140-180 NP 7.4 67.0 101-03010H-5, 30-32 50.4 84.60 11.9 104-031 NP 10H-6, 30-32 73.9 86.10 100-180 85.80 51.9 105-030 INT 11H-1, 30-32 10.2 100-180 57.6 90.31 106-030 150-21011H-2, 31-33 13.1 345.7 48.9 91.80 111-030 150-27011H-3, 33-35 132.9 64.5 13.1 N 93.30 112-031 272.3 140-21011H-5, 30-32 NPP 95.30 113-030 306.6 150-27011H-6, 6.5 30-32 45.2 96.81 115-030 180-24012H-2, 4.1 30-32 N 50.0 41.6 74.8 98.33 116-030 348.2 180-27012H-3, 30-32 101.30 N 9.1 68.0 122-030 320.8 150-270 10.4 102.80 210-240 N 16.1 123-030 267.812H-7, 30-32 47.3 106.30 150-240 71.9 20.0 132.113H-1, 31-33 N 107.80 NP 100-250 46.9 127-030 23.3 NP 13H-2, 31-33 15.9 119.5 140-240 74.1 28.3 NPP 131-03113H-3, 31-33 113.80 274.7 74.7 31.4 132-03113H-6, 31-33 114.31 N?? 295.2 180-240 48.6 16.7 NPP 133-03113H-7, 31-33 69.6 115.81 140-210 11.8 NPP 136-03114H-2, 30-32 53.2 117.31 145.0 100-200 28.5 NPP 137-03114H-3, 30-32 86.6 121.81 115.4 150-210 8.0 142-030 NP 14H-4, 30-32 123.31 40.5 138.7 240-270 NPP 143-03014H-5, 30-32 40.1 125.30 16.8 180.8 150-240 NPP 144-03014H-7, 30-32 49.4 126.80 NPP 140-300 145-03015H-1, 29-31 80.0 128.30 26.3 4.2 N?? 218.9 180-270 147-03015H-2, 29-31 41.9 129.80 22.1 300.1 180-270 151-02916X-2, 125-128 132.80 14.9 NPP 150-240 152-029 96.8 162-12516X-4, 40.3 80-83 46.9 133.29 12.4 NPP 301.0 240-24016X-5, 25-27 80.7 134.79 N?? 141.75 213.9 150-270 164-08017X-2, 23-25 24.7 40.1 328.5 210-270 NP 74.4 180-300 165-025 37.8 17.4 144.30 172-025 91.7 66.3 N?? 145.25 NP 150-240 120.6 30.0 84.9 77.8 20.2 146.43 NPP 140-300 31.0 184.1 240-330 72.8 NPP 37.7 205.6 NP 52.9 0.0 NPP 324.4 6.3 48.7 42.9 19.1 N?? 64.5 NPP N?? 6.3 NP 22.6 NP NPP section, interval section, Table T5 (continued). (continued). T5 Table J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 57 each sample. Declinationeach sample. and inclination netic vectors to obtain the characteristic direction. The polar- des of gray or hatchure fill in the schematic column reflecting ignments are based on the polarity pattern and biostratigraphicignments pattern on the polarity are based h hole are on the associateddisplayed magnetostratigraphic fig- ? C17r C17n chron chron Polarity assignment Comments Polarity column rating Polarity 9.6 22.2 RPP – 18.6 6.7 R 14.7 26.0 RP C17r – – Characteristic magnetization and polarity and magnetization Characteristic Characteristic direction Declination Inclination MAD Schematic Generalized C) ° ( Interval Depth Depth (mbsf) C) indicates the demagnetization range that was the demagnetization usedandC) indicates to compute polarity of magnetization the characteristic direction for ° Run Run name (cm) ure. The interval ( The ure. are in degrees. MAD (mean angular dispersion) values indicate the precision of the three-dimensional line fit of these paleomag line fit of the three-dimensional of the precision indicate values dispersion) angular MAD (mean in are degrees. columns polarity N) are is explained in the text. Two shown with the sha NP, N??, NPP, R??, INT, RPP, ity rating system (R, RP, main column polarity intervals. and the Polarity chron ass indicating samples the generalized rating of individual polarity the to constraints in correlating polarity magnetic the reference scale. time facies/Core, facies/Core, Position, age, 18X-4, 129-131 184-129 160.09 100-200 172.1 41.1 12.5 NP 20X-CC, 25-28 209-025 183.17 150-400 96.6 19X-4, 87-89 194-087 169.27 140-180 330.5 32.0 20.6 INT 17X-5, 40-42 175-04018X-1, 20-22 151.10 181-02018X-5, 62-64 140-270 154.50 185-06219X-3, 113-115 44.8 140-180 193-113 160.92 168.03 140-480 35.9 38.1 180-24020X-6, 33-35 262.9 17.7 314.5 73.0 206-033 181.33 NPP 12.3 72.6 180-300 NPP 179.1 13.8 N?? 19X-1, 93-95 191-093 164.83 140-300 268.2 32.6 25.8 N?? section, interval section, Table T5 (continued). (continued). T5 Table Eocene middle 12-m gap in discrete sampling Notes: Sediment facies are generalized color-texture fromdescriptions shipboard observations, and the lithologic units for eac J.G. OGG AND L. BARDOT MAGNETOSTRATIGRAPHIC CORRELATION OF THE BLAKE NOSE TRANSECT 58 e on the ) 95 α 0 shipboard pass-through cryogenic magnetometer mea- magnetometer cryogenic pass-through shipboard 0 )Paleolatitude(N*, )Paleolatitude(N*, 95 α 20.9 2) (40, ) Paleolatitude (N*, 95 α ) Paleolatitude (N*, 95 α are the weighted number of samples of N, NP, RP, and R polarity rating (“P”-rated are given half weight) and the 95% confidenc and the weight) half given are (“P”-rated rating and R polarity RP, NP, of N, samples of number the weighted are 95 α ) Paleolatitude (N*, 95 α Hole 1049A Hole C 1050A, Hole 1051A Hole E1052A, Hole 1053A Hole Paleolatitude (N*, Paleolatitude of Leg 171B sites. 171B Leg of Paleolatitude Age paleolatitude computed by the method of Kono (1980). The second Albian listing for Site 1052 is from the mean ofinclination 72 surements at 5-cm intervals within the recovered 1998e). sediments of Hole 1052E (Shipboard Scientific Party, EocenePaleoceneMaastrichtianConiacian-TuronianCenomanianAlbian Aptian-Albian 22.2 22.7 22.8 2.7) (31.5, 12.3) (4.5, 9.4) (8.5, 35.6 23.3 23.6 17.1 (11.5, 10.9) 5.8) (21.5, 2.9) (54.5, 2.1) (57.5, 18.4 21.9 22.3 20.8 (10, 6) 19) (2.5, 26.2 2.7) (61.5, 7.7) (12, 4.9) (8.5, 28.5 23.2 4.7) (28.5, 5.5) (14.5, 22.4 27.1 9.6) (14.5, 9.3) (6, 23.0 24.7 (720, 2.6) 10.5) (4.5, Table T6. T6. Table Notes: Paleolatitudes are in °N. Parameters N* and