DOCSLIB.ORG

Cephalopod Diversity Within a Concretionary Inverval of the Pierre Shale (Upper Cretaceous) in Dawes County, Northwestern Nebraska

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Transactions of the Nebraska Academy of Sciences and Affiliated Societies Nebraska Academy of Sciences 1993 Cephalopod Diversity within a Concretionary Inverval of the Pierre Shale (Upper Cretaceous) in Dawes County, Northwestern Nebraska Darryl Tharalson Chadron State College Follow this and additional works at: https://digitalcommons.unl.edu/tnas Part of the Life Sciences Commons Tharalson, Darryl, "Cephalopod Diversity within a Concretionary Inverval of the Pierre Shale (Upper Cretaceous) in Dawes County, Northwestern Nebraska" (1993). Transactions of the Nebraska Academy of Sciences and Affiliated Societies. 125. https://digitalcommons.unl.edu/tnas/125 This Article is brought to you for free and open access by the Nebraska Academy of Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Transactions of the Nebraska Academy of Sciences and Affiliated Societiesy b an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. 1993. Transactions of the Nebraska Academy of Sciences, XX: 87-95 CEPHALOPOD DIVERSITY WITHIN A CONCRETIONARY INTERVAL OF THE PIERRE SHALE (UPPER CRETACEOUS) IN DAWES COUNTY, NORTHWESTERN NEBRASKA Darryl Tharalson Science Department Chadron State College Chadron, Nebraska 69337-2690 ABSTRACT reported to have been collected at Chadron, Nebraska. Dunham (1961a, b; because the content of these two A concretionary interval within the Pierre Shale, where works is essentially identical, only the 1961a report it outcrops across northern Dawes County, is characterized subsequently will be referred to in the body of this by a diversity of cephalopod taxa. The interval falls within the ammonite zones of Exiteloceras jenneyi to Baculites paper) included a rather detailed description of the cuneatus of the upper Campanian. Three or more of the Pierre Shale in the Chadron area as well as many ofthe following cephalopod taxa have been collected at each of the fossil localities described in this report; however, nei­ seventeen sites described herein: Eutrephoceras dekayi ther of his studies has been published. Tourtelot and (Morton); Baculites compressus Say; B. cuneatus Cobban; Rye (1969) analyzed oxygen and carbon isotopes present Didymoceras cheyennense (Meek and Hayden); Exiteloceras in a number of specimens of Baculites collected from jenneyi (Whitfield); Jeletzkyites nodosus (Owen); Placenticeras three localities in northern Dawes County. Cobban intercalare Meek; P. meeki Boehm; and Solenoceras cf. S. (1987) reported collecting a specimen of Rhaeboceras crassum (Whitfield). The interval that yields cephalopod Meek in 1965 from northeastern Dawes County. diversity comprises a stratigraphic thickness of about 15 to 20 meters and appears to occur roughly 300 meters above the base ofthe Pierre Shale in northeastern Dawes County. The Several of the cephalopod taxa that occur within fossils are present within calcareous concretions imbedded in the concretionary interval emphasized in this paper gray to olive-gray shale in the lower portion ofthe upper part have substantial biostratigraphic value. Thus, of the Pierre Shale in this area. The interval seemingly Exiteloceras jenneyi, Didymoceras cheyennense, correlates, at least in part, with the lower unnamed shale Baculites compressus, and B. cuneatus define succes­ member of the Pierre Shale in the Red Bird area in eastern sive ammonite zones for the upper Campanian in the Wyoming. U. S. western interior. In northern Dawes County, the fossiliferous concretionary interval of special interest t t t in the upper part of the Pierre Shale is sporadically exposed in a belt roughly 6 to 8 km wide that extends The Pierre Shale outcrops across some 900 sq. km from near the southwestern corner ofT33N, R49W in a (350 sq. mi.) in northern Dawes County, northwestern northeasterly direction into the eastern half of T35N, Nebraska (Fig. 1). Southernmost exposures occur near R49W (Fig. 1) and then northward a few km in Shan­ the city of Chadron and Pierre Shale constitutes bed­ non County, South Dakota. Across much of the west­ rock over most of the area northward into South Da­ ern two-thirds of northern Dawes County, the fossilif­ kota. However, thick, extensive, and well-developed erous concertionary interval is covered by strati­ exposures are almost nonexistent in this region of pre­ graphically higher portions of the upper part of the dominantly rolling, grass-covered hills. Pierre Shale. In addition to a description of cephalopod occurrence, this report includes a fairly detailed ac­ Very little has been published on the Pierre Shale count of Pierre Shale surficial stratigraphy in this area. and its macrofossil content in this area. Whitfield [In this regard, the earlier work of Dunham (1961a) has (1901) described an exceptionally well-preserved speci­ been particularly helpful.) men of Didymoceras stevensoni Whitfield, which was 87 88 D. Tharalson •. 49W. R.4IW. T.35N. US 385 T.34N. 38 ~~._3_2 __~~ __~~ ___________3_9·~ ____________-+_t T.33N. US 20 uno Figure 1. Map showing the locations ofCSC-Kp sites described in this paper where concretions in the upper part of the Pierre Shale in northeastern Dawes County have yielded cephalopod diversity. STRATIGRAPHY OF THE PIERRE SHALE DeGraw (1975) and Shurr (1984). The regional contact between the Pierre Shale and overlying Chadron For­ Meek and Hayden (1861: 419-424) proposed the mation (Oligocene) is a disconformity. The Pierre Shale name Fort Pierre Group for a sequence of dark shale remaining in northern Dawes County seems to be at exposed near the fur-trading post of Fort Pierre, which least 400 m thick, and outcrops consist of dark shale at that time was on the Missouri River floodplain some comprising several lithologic zones characterized by 6 km north of the present community of the same the presence or absence of bentonite beds and concre­ name. The name for the rock unit has subsequently tions as well as variations. in the nature of the shale been changed to Pierre Shale. The present thickness of (Fig. 2). the Pierre Shale in the type area is about 300 m (1,000 ft) (Crandell, 1958). Crandell (1958: 9) subdivided the Sharon Springs Member Pierre Shale for the type area in central South Dakota The Sharon Springs Member, whose type locality is into 8 members which are, in ascending order, the in western Kansas (Elias, 1931), constitutes the basal Sharon Springs, Gregory, Crow Creek, DeGrey, Pierre Shale in northern Dawes County. It consists Verendrye, Virgin Creek, Mobridge, and Elk Butte mem­ chiefly of relatively resistant (buttress-weathering) lami­ bers. He noted that all except the Sharon Springs nated, dark gray to black shale that includes much Member crop out in the Pierre area. bituminous material as well as abundant small scales and other fish fossils. It contains several bentonite At the few outcrops [e. g., in T35N, R47W, Sec. 30dc beds and concretionary layers and weathers to fissile, (see description of sites collected section for an explana­ silvery-gray flakes. Portions ofthe Sharon Springs are tion of the T-R locational format employed herein)] in locally exposed in extreme northeastern Dawes County northeastern Dawes County where I think I have ob­ on the western side of the Chadron Dome. The finest served the contact between the Niobrara Formation exposure of this member in the immediate area is just and Pierre Shale that contact appears to be gradational across the state line from Dawes County in Shannon and conformable. However because of the generally County, South Dakota, where relatively complete sec­ poor quality of such exposures, misinterpretation ofthe tions ofthe unit are exposed in buttes and along gullies boundary relationships is entirely possible. Thus it in T35N, R47W, Secs. 16 and 17. Moore (1954: 36) may be that the Niobrara-Pierre contact in this area reported finding a knife-edge contact of the Sharon actually is an unconformity as has been asserted (pri­ Springs Member and the underlying Fort Hays Lime­ marily on the basis of subsurface correlations) by, e.g., stone Member of the Niobrara Formation in Sec. 16, APprOXimatel Generalized I Lithologic and Biostratigraphic Thickness Section ti:t~ e (meters) Character ~ Shale Bentonite Concretion The Upper Part is mostly light olive gray, non calcareous shale. Baculiles grandis occurs in the upper 40 m. Medium to large septarian concretions are 100 ~ present at a numher onevels about 40 to [ eM Upper Part 100+ 60 m above the base. Medium to large calcareous concretions that o ~ commonly contain a diversity of ammonites and other molluscs occur in an interval about - ~ 10 to 30 m above the base (this is the interval I being emphasized in this report). \ = \ 00. The Middle Part is chiefly grayish, noncalcareous shale. \ Small reddish brown, sideritic concretions are \ C') common through a thickness of about 20 m just \ >§ =----::~ below the gumbo zone at the top ofthe Middle Part. if ~ ~-----= Medium to large calcareous concretions-usually Middle Part 300 devoid of macrofossils and commonly \ .g 1: I:--: septarian-occur at several horizons in the \ ~ Middle Part. ~ Abundant small, reddish, sideritic ironstone \ S· ~ concretions-often consisting of Baculiles S. casts-are abundant in the lower 25 m. \ \ '"~ ~ \ .,'" ~ ~ This member is predominantly hard, fissiie, carbonaceous, dark gray shale; typically \ containing abundant tiny, fragmental fish remains. \ ~ ~ Sharon Springs ~ 25 Numerous cream to
Recommended publications
  • Nautiloid Shell Morphology

    Nautiloid Shell Morphology

    MEMOIR 13 Nautiloid Shell Morphology By ROUSSEAU H. FLOWER STATEBUREAUOFMINESANDMINERALRESOURCES NEWMEXICOINSTITUTEOFMININGANDTECHNOLOGY CAMPUSSTATION SOCORRO, NEWMEXICO MEMOIR 13 Nautiloid Shell Morphology By ROUSSEAU H. FLOIVER 1964 STATEBUREAUOFMINESANDMINERALRESOURCES NEWMEXICOINSTITUTEOFMININGANDTECHNOLOGY CAMPUSSTATION SOCORRO, NEWMEXICO NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY E. J. Workman, President STATE BUREAU OF MINES AND MINERAL RESOURCES Alvin J. Thompson, Director THE REGENTS MEMBERS EXOFFICIO THEHONORABLEJACKM.CAMPBELL ................................ Governor of New Mexico LEONARDDELAY() ................................................... Superintendent of Public Instruction APPOINTEDMEMBERS WILLIAM G. ABBOTT ................................ ................................ ............................... Hobbs EUGENE L. COULSON, M.D ................................................................. Socorro THOMASM.CRAMER ................................ ................................ ................... Carlsbad EVA M. LARRAZOLO (Mrs. Paul F.) ................................................. Albuquerque RICHARDM.ZIMMERLY ................................ ................................ ....... Socorro Published February 1 o, 1964 For Sale by the New Mexico Bureau of Mines & Mineral Resources Campus Station, Socorro, N. Mex.—Price $2.50 Contents Page ABSTRACT ....................................................................................................................................................... 1 INTRODUCTION
  • Cozzette Sandstone, Book Cliffs, Colorado, U.S.A

    Cozzette Sandstone, Book Cliffs, Colorado, U.S.A

    Journal of Sedimentary Research, 2015, v. 85, 459–488 Research Article DOI: http://dx.doi.org/10.2110/jsr.2015.26 TECTONICALLY CONTROLLED NEARSHORE DEPOSITION: COZZETTE SANDSTONE, BOOK CLIFFS, COLORADO, U.S.A. 1 2 2 ANDREW S. MADOF, NICHOLAS CHRISTIE-BLICK, AND MARK H. ANDERS 1Chevron Energy Technology Company, Houston, Texas 77002-7308, U.S.A. 2Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964-8000, U.S.A. e-mail: [email protected] ABSTRACT: The Book Cliffs of eastern Utah and western Colorado have been pivotal in the development of outcrop-based sequence stratigraphic concepts for nonmarine to shallow marine siliciclastic depositional settings. Prior studies in this area, and more generally in the Cretaceous western interior foreland basin of North America, have concluded that nearshore accumulation is controlled for the most part by the interaction between oscillatory eustatic change and longer-term regional patterns of flexural subsidence. New outcrop and subsurface evidence reported here from the eastern Book Cliffs suggests that three-dimensional tectonic tilting at length scales of up to , 50 km (31 mi) and timescales of less than , 200 kyr also strongly influenced sedimentation. Continental ice sheets are thought to have been small at the time. Documented patterns of accumulation are inconsistent with those expected from interactions of eustasy and regional flexure alone. The upper Campanian Cozzette Sandstone Member of the Mount Garfield Formation consists of twelve lithofacies arranged into six lithofacies assemblages, inferred to have been deposited in shallow marine, marginal marine, and nonmarine depositional environments.
  • Montana Group and Equivalent Rocks, Montana, Wyoming, and North and South Dakota

    Montana Group and Equivalent Rocks, Montana, Wyoming, and North and South Dakota

    GEOLOGY LIBRARY-j 2nd SETi Stratigraphy and Geologic History of the Montana Group and Equivalent Rocks, Montana, Wyoming, and North and South Dakota GEOLOGICAL SURVEY PROFESSION AL PAPER 776 INSTITUTE OF Q / NT \T AU G 27 1973 volt TECHNOLOGY metadc303 96 6 I Stratigraphy and Geologic History of the Montana Group and Equivalent Rocks, Montana, Wyoming, and North and South Dakota By J. R. GILL and W. A. COBBAN GEOLOGICAL SURVEY PROFESSIONAL PAPER 776 Stratigraphic,paleontologic, and radiometric data are N r combined to determine the paleogeography for a part of the upper Upper Cretaceous UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1973 UNITED STATES DEPARTMENT OF THE INTERIOR ROGERS C. B. MORTON, Secretary GEOLOGICAL SURVEY V. E. McKelvey, Director Library of Congress catalog-card No. 73-600136 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price 85 cents domestic postpaid or 60 cents GPO Bookstore Stock Number 2401-00342 CONTENTS Page Page Abstract ..................................................................................... 1 Geologic history of the Montana Group ................................ 20 Introduction ................................................................................ 1 Telegraph Creek--Eagle regression..................................20 Geologic setting -......................................................................................................... ........ 2 0 Amm -onitesequence --------------------------------------- Judith
  • Late Cretaceous Nautilid Juveniles of Cymatoceras Reussi and Eutrephoceras Aff

    Late Cretaceous Nautilid Juveniles of Cymatoceras Reussi and Eutrephoceras Aff

    SBORNÍK NÁRODNÍHO MUZEA V PRAZE ACTA MUSEI NATIONALIS PRAGAE Řada B – Přírodní vědy • sv. 70 • 2014 • čís. 3–4 • s. 143–152 Series B – Historia Naturalis • vol. 70 • 2014 • no. 3–4 • pp. 143–152 LATE CRETACEOUS NAUTILID JUVENILES OF CYMATOCERAS REUSSI AND EUTREPHOCERAS AFF. SUBLAEVIGATUM – SCARCE FOSSILS UNDER RISK OF PYRITE DEGRADATION JIŘÍ FRANK JAN SKLENÁŘ BORIS EKRT National Museum, Department of Palaeontology, Václavské náměstí 68, 115 74 Praha 1, the Czech Republic; e-mails: [email protected]; [email protected]; [email protected] Frank, J., Sklenář, J. Ekrt, B. (2014): Late Cretaceous nautilid juveniles of Cymatoceras reussi and Eutrephoceras aff. sublaevigatum – scarce fossils under risk of pyrite degradation. – Acta Mus. Nat. Pragae, Ser. B, Hist. Nat., 70(3-4): 143–152, Praha. ISSN 1804-6479. Abstract. The syntype collection of “Nautilus reussi” has been subject to a detailed revision resulting in confirmation of at least provisional validity of the species represented by a single juvenile specimen. This species, restricted now to the Late Coniacian, is inserted into the genus Cymatoceras Hyatt, 1884. The rest of the collection differs from the original description and is left separately as Eutrephoceras aff. sublaevi- gatum, being considered juveniles of the species. The lithology, geographic and stratigraphic position of the type locality of Cymatoceras reussi (FRITSCH IN FRITSCH ET SCHLÖNBACH, 1872) as well as the other sites are discussed here. The valuable material is endangered due to pyrite degradation as relics of this unstable sulphide are still at present hidden in the secondary limonitic material. The degradation products cause volumetric expansion resulting in formation of crevices and loss of integrity.
  • Cretaceous Fossils from the Chesapeake and Delaware Canal

    Cretaceous Fossils from the Chesapeake and Delaware Canal

    Cretaceous S;cial Publication No. 18 Fossils from the Chesapeake and Delaware Canal A Guide for Students and Collectors Edward M. Lauginiger / /~ / CRETACEOUS FOSSILS FROM THE CHESAPEAKE AND DELAWARE CANAL: A GUIDE FOR STUDENTS AND COLLECTORS By Edward M. Lauginiger Biology Teacher Academy Park High School Sharon Hill, Pennsylvania September 1988 Reprinted 1997 CONTENTS Page INTRODUCTION. • 1 ACKNOWLEDGMENTS 2 PREVIOUS STUDIES. 3 FOSSILS AND FOSSILIZATION 5 Requirements for Fossilization 6 Types of Fossilization 7 GEOLOGY •• 10 CLASSIFICATON OF FOSSILS. 12 Kingdom Monera • 13 Kindgom Protista 1 3 Kingdom Plantae. 1 4 Kingdom Animalia 15 Phylum Porifera 15 Phylum Cnidaria (Coelenterata). 16 Phylum Bryozoa. 16 Phylum Brachiopoda. 17 Phylum Mollusca • 18 Phylum Annelida •. 22 Phylum Arthropoda • 23 Phylum Echinodermata. 24 Phylum Chordata 24 COLLECTING LOCALITIES 28 FOSSIL CHECK LIST 30 BIBLIOGRAPHY. 33 PLATES. ••• 39 iii FIGURES Page Figure 1 • Index map of the Chesapeake and Delaware Canal Area. .. .. 2 Figure 2. Generalized stratigraphic column of the formations exposed at the C & D Canal. 11 Figure 3. Foraminifera 14 Figure 4. Porifera 16 Figure 5. Cnidaria 16 Figure 6. Bryozoa. 17 Figure 7. Brachiopoda. 18 Figure 8. Mollusca-Gastropoda. 19 Figure 9. Mollusca-Pelecypoda. 21 Figure 10. Mollusca-Cephalopoda 22 Figure 11. Annelida . 22 Figure 12. Arthropoda 23 Figure 13. Echinodermata. 25 Figure 1 4. Chordata . 27 Figure 1 5. Collecting localities at the Chesapeake and Delaware Canal . ... .. 29 v CRETACEOUS FOSSILS FROM THE CHESAPEAKE AND DELAWARE CANAL: A GUIDE FOR STUDENTS AND COLLECTORS Edward M. Lauginiger INTRODUCTION Fossil collectors have been attracted to Delaware since the late 1820s when the excavation of the Chesapeake and Delaware (C&D) Canal first exposed marine fossils of Cretaceous age (Fig.
  • Baculites Baculus Meek and Hayden, 1861

    Baculites Baculus Meek and Hayden, 1861

    New Mexico Geological Society Downloaded from: https://nmgs.nmt.edu/publications/guidebooks/70 Baculites Baculus Meek and Hayden, 1861 (Earliest Maastrichtian) from the Uppermost Pierre Shale in the Raton basin of Northeastern New Mexico and its Significance Paul L. Sealey and Spencer G. Lucas, 2019, pp. 73-80 in: Geology of the Raton-Clayton Area, Ramos, Frank; Zimmerer, Matthew J.; Zeigler, Kate; Ulmer-Scholle, Dana, New Mexico Geological Society 70th Annual Fall Field Conference Guidebook, 168 p. This is one of many related papers that were included in the 2019 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks.
  • The Upper Campanian – Lower Maastrichtian Cephalopod Fauna of Botellos, Nuevo León: a Key to Understand Faunal Turnover Acros

    The Upper Campanian – Lower Maastrichtian Cephalopod Fauna of Botellos, Nuevo León: a Key to Understand Faunal Turnover Acros

    Acta Geologica Polonica, Vol. 67 (2017), No. 1, pp. 145–162 DOI: 10.1515/agp-2017-0009 The Upper Campanian – lower Maastrichtian cephalopod fauna of Botellos, Nuevo León: a key to understand faunal turnover across the Campanian–Maastrichtian boundary in NE Mexico CHRISTINA IFRIM1*, JACOBO EDGAR LARA DE LA CERDA2, VICTOR HUGO PEÑA PONCE2 and WOLFGANG STINNESBECK1 1Institut für Geowissenschaften, Ruprecht-Karls-Universität, D-69120 Heidelberg, Germany *E-mail: [email protected] 2Universidad Humanista De Las Americas, Martin de Zavala # 510, Monterrey, C.P. 64000, N.L., México ABSTRACT: Ifrim, C., Lara de la Cerda, J.E., Peña Ponce, V.H. and Stinnesbeck, W. 2017. The Upper Campanian – lower Maastrichtian cephalopod fauna of Botellos, Nuevo León: a key to understand faunal turnover across the Campanian–Maastrichtian boundary in NE Mexico. Acta Geologica Polonica, 67 (1), 145–162. Warszawa. A new cephalopod collection from the Campanian-Maastrichtian boundary interval of NE Mexico, consisting of 1076 individuals assigned to 29 species and 22 genera is presented. This collection is a mix of ammonoids, one coleoid and one nautilid, which originate from at least three ammonoid biozones: The upper Campan- ian Exiteloceras jenneyi and Nostoceras (Nostoceras) hyatti zones, and the lower Maastrichtian Pachydiscus (Pachydiscus) neubergicus Zone. The age of the collection is thus middle late Campanian to late early Maas- trichtian, and it closes a stratigraphic gap between faunas described formerly from this region. The specimens are nuclei collected from the desert pavement. The abundance of specimens allows for a comparison to other Campanian–Maastrichtian ammonoid records from Mexico, North America and Europe.
  • Scaphitid Ammonite Correlation of the Late Maastrichtian Deposits in Poland and Denmark

    Scaphitid Ammonite Correlation of the Late Maastrichtian Deposits in Poland and Denmark

    Scaphitid ammonite correlation of the Late Maastrichtian deposits in Poland and Denmark Machalski, M. 1996. Scaphitid ammonite correlation of the Late Maastrichtian deposits in Poland and Denmark. - Acta Palaeontologica Polonica 41,4,369-383. Evolutionary changes in the ribbing density on body chambers in samples of the scaphitid ammonite Hopbscaphites constrictus (J.Sowerby, 1817) are used for time correlation of the Kazimierz Opoka (Late Maastrichtian, Belemnella kazimiro- uiensis Zone, Poland) with the Danish White Chalk succession. It is proposed that the upper part of the Kazimierz Opoka corresponds to the lower part of the B. kazimiroviensis Zone in Denmark while the lower part of the unit probably corresponds to the upper part of the Belemnitellajunior Zone in Denmark. This correlation, if correct, suggests diachronism of the lower boundary of the B. kazimirouiensis Zone. K e y w o r d s : Maastrichtian, Scaphitidae, ammonites, Poland, Denmark, strati- graphy. Marcin Machalski, Instytut Paleobiologii PAN, al. ~wirkii Wigury 93, PL-02-089 Warszawa, Poland Introduction The Kazirnierz Opoka is an informal lithostratigraphical term (Wyrwicka 1980) for the Late Maastrichtian siliceous chalk unit exposed along the Vistula River near Kazimierz Dolny (called also 'Kazimierz' or 'Kazimierz- -on-Vistula'), Central Poland (Fig. 1A-C). This unit yields possibly one of the richest fossil assemblages known from the European Maastrichtian (see Abdel-Gawad 1986 and Radwariski 1996 for comprehensive review). Ammonites from the Kazimierz Opoka were described by Eopuski (1911 ), Poiaryska (1953), and Blaszkiewicz ( 1980). Radwafiski ( 1996) described predation traces on Hoploscaphites constrictus (J. Sowerby, 1817) whereas Marcinowski & Radwanski (1996) commented on two pachydiscids from the top of Kazimierz Opoka [the specimen identified by them as Anapachydiscus cf.
  • Localities for Eutrephoceras Sloani in North Cookanum

    Localities for Eutrephoceras Sloani in North Cookanum

    EUTREPHOCERAS (NAUTILOIDEA) FROM THE PALEOCENE BEAUFORT FORMATION OF NORTH CAROLINA RICHARD H. BAILEY NORTHEASTERN UNIVERSITY, BOSTON, MASS. ABSTRACT characteristics for separation of species seem Well preserved specimens of Eutre­ to be conch shape and suture pattern. Speci­ phoceras sloani Rceside, collected from a mens of Eutrephoceras frequently have been recently exposed outcrop of the Paleocene subjected to post-depositional compression, Beaufort Formation in east-central North which greatly distorts the conch shape, and Carolina, represent the first reported Paleo­ complicates the separation of species. Detail­ cene nautiloids from Coastal Plain strata of ed consideration of suture patterns adds North Carolina. This species was formerly objectivity to the rather general comparisons known only from the Paleocene Black Mingo that have been made among species of Formation in eastern South Carolina, about Eutrephoceras in the past. All of the suture 280 km southwest of the North Carolina patterns (text fig. 5) used for species com­ Paleocene outcrops. The North Carolina parisons were taken from type specimens. Most of these suture patterns have not been specimens allow clarification and elaboration illustrated and compared graphically. of Reeside's original description. STRATIGRAPHY INTRODUCTION The new North Carolina outcrop consists Fossil nautiloids are generally rare m of 1.4 m of Paleocene strata which is dis- Paleocene strata of the Atlantic Coastal Plain. This scarcity of nautiloid specimens PA. probably results in part from a rather limited area of Paleocene outcrop; however, eco­ logical factors may also be important. A recently exposed Paleocene outcrop in east-central North Carolina yielded well preserved nautiloid specimens. These nauti­ loids, identified in this paper as Eutrepho­ ceras sloani Reeside, represent the first reported Paleocene cephalopods from North Carolina.
  • Cephalopods from the Late Eocene Hoko River Formation, Northwestern Washington Richard L

    Cephalopods from the Late Eocene Hoko River Formation, Northwestern Washington Richard L

    Oi<~e2> K A.. Natural History Museum ifiCl^i Of Los Angeles County IVooCL Invertebrate Paleontology J. Vakom.. 62(1). 1988. pp. 76-82 Copyright 1488. The- Paleontologual Society 0022-3360,88/0062-0076S03.00 CEPHALOPODS FROM THE LATE EOCENE HOKO RIVER FORMATION, NORTHWESTERN WASHINGTON RICHARD L. SQUIRES Department of Geological Sciences, California State University, Northridge 91330 ABSTRACT—Rare specimens of the nautiloids Nautilus and Aturia and extremely rare specimens of a sepiamorph sepiid are described from the late Eocene Hoko River Formation, northern Olympic Peninsula, Washington. The well-preserved partial phragmocones are from channel-fill clastics deposited on the inner and middle slopes of a submarine-fan system. The Nautilus specimen is allied to N. cookanum Whitfield from middle Eocene strata, New Jersey, and is probably conspecific with Nautilus sp. (Miller) from late Eocene strata, northwestern Oregon, both of which were previously assigned to Eutrephoceras. This is the first record of Nautilus in the northeastern Pacific. The Aturia specimen is tentatively identified as A. cf. A. alabamensis (Morton), a species previously only known from late Eocene strata in the Atlantic-Gulf Coastal area and northeastern Mexico. Aturia alabamensis may be the same as numerous Eocene North American aturiid species. The two sepiamorph sepiid specimens resemble Belosepia Voltz but are probably generically distinct. They are only the second record of sepiids in the Eocene of the northeastern Pacific. INTRODUCTION rizian Stage (late Eocene). He also inferred, based on the benthic ATE EOCENE cephalopods are rare in the northeastern Pacific. foraminifers, that the formation was deposited in relatively cool, L moderately shallow ocean waters between lower neritic and up- The occurrence of three genera at a locality in northwestern permost bathyal depths.
  • Multinodose Scaphitid Cephalopods from the Lower Part of the Pierre Shale and Equivalent Rocks in The

    Multinodose Scaphitid Cephalopods from the Lower Part of the Pierre Shale and Equivalent Rocks in The

    Multinodose Scaphitid Cephalopods from the Lower Part of the Pierre Shale and Equivalent Rocks in the GEOLOGICAL SURVEY PROFESSIONAL PAPER 483-E Multinodose Scaphitid Cephalopods from the Lower Part of the Pierre Shale and Equivalent Rocks in the Conterminous United States By WILLIAM A. COBBAN and GLENN R. SCOTT CONTRIBUTIONS T O PALEONTOLOGY GEOLOGICAL SURVEY PROFESSIONAL PAPER 483-E Three species ofammonites, assigned to the new genus Trachyscaphites,^>r0^/dk a means for the correla­ tion of Upper Cretaceous strata between the West­ ern Interior, the Gulf Coastal Plain, and Europe UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1964 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director The U.S. Geological Survey Library has cataloged this publication as follows: Cobban, William Aubrey, 1916- Multinodose scaphiticl cephalopods from the lower part of the Pierre Shale and equivalent rocks in the conterminous United States, by William A. Cobban and Glenn K. Scott, Washington, U.S. Govt. Print. Off., 1964. iii, 13 p. 4 plates, map, diagrs., tables. 29 cm. (U.S. Geological Survey. Professional paper 483-E) Contributions to paleontology. Bibliography: p. 12-13. 1. Ammonoidea. 2. Scaphites. 3. Paleontology Cretaceous. I. Scott, Glenn Robert, 1918 joint author. II. Title. (Series) For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, B.C. 20402 CONTENTS Page Abstract..___________________________ El Introduction. ________________________ 1 Geographic distribution._______________ 2 Stratigraphic summary._______________ 2 Important associated fossils ____________ 3 Comparisons with other scaphitid faunas. 4 Gulf Coastal Plain________________ 4 Europe._________________________ 5 6 Systematic descriptions. 6 Ref erences cited _______ 12 ILLUSTRATIONS PLATE 1.
  • Giant Scaphitid Ammonites from the Maastrichtian of Europe

    Giant Scaphitid Ammonites from the Maastrichtian of Europe

    BULLETIN DE L'INSTITUT ROYAL DES SCIENCES NATURELLES DE BELGIQUE SCIENCES DE LA TERRE. 69: 133-154, 1999 BULLETIN VAN HET KONINKLIJK BELGISCH INSTITUUT VOOR NATUURWETENSCHAPPEN AARDWETENSCHAPPEN, 69: 133-154. 1999 Giant scaphitid ammonites from the Maastrichtian of Europe by John W.M. JAGT, W. James KENNEDY & Marcin MACHALSKI Abstract trichtien supérieur, ne peuvent être attribuées avec certitude à un sous- genre. Giant scaphitid ammonites from the Maastrichtian of Europe have Mots-clefs: Ammonoidea, Scaphitidae, Crétacé supérieur, nouveaux generally been assigned to Acanthoscaphites NOWAK, 1911. Prior to taxa. Europe. the present study, this genus comprised five species: A. tridens (KNER. 1848), A. varians (LOPUSKI, 1911), A. verneudianus (D'ORBIGNY, 1841), A. sp. of KENNEDY (1987) and A. sp. of KENNEDY & CHRISTEN¬ SEN (1997). Of the first-named taxon, material from Aachen-Schnee¬ berg of Early Maastrichtian age, including the specimen illustrated by Introduction HOLZAPFEL (1887-89) long thought to have been lost, is described. Recently collected topotype material from Kazimierz Dolny, and from Subsequent to JELETZKY (1951), who used Acanthosca• Rejowiec (Poland), of latest Maastrichtian age {Belemnella kazimiro- viensis Zone), allows A. varians to be revised. Specimens from the late phites tridens as index for the lowest macrofossil zone of Early and early Late Maastrichtian of NW Europe, assigned to A. the Maastrichtian Stage, use of this giant scaphitid as an varians, differ consistently in details of ornament, and are assigned Early Maastrichtian index fossil has appeared in a number to a new subspecies, A. v. blaszkiewiczi n. subsp. Style of ribbing and tuberculation of the varians stock differs from that of A.