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Schmitz, M. D. 2000. Appendix 2: Radioisotopic Ages Used In

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Appendix 2 Radioisotopic ages used in GTS2020 M.D. SCHMITZ 1285 1286 Appendix 2 GTS GTS Sample Locality Lat-Long Lithostratigraphy Age 6 2s 6 2s Age Type 2020 2012 (Ma) analytical total ID ID Period Epoch Age Quaternary À not compiled Neogene À not compiled Pliocene Miocene Paleogene Oligocene Chattian Pg36 biotite-rich layer; PAC- Pieve d’Accinelli section, 43 35040.41vN, Scaglia Cinerea Fm, 42.3 m above base of 26.57 0.02 0.04 206Pb/238U B2 northeastern Apennines, Italy 12 29034.16vE section Rupelian Pg35 Pg20 biotite-rich layer; MCA- Monte Cagnero section (Chattian 43 38047.81vN, Scaglia Cinerea Fm, 145.8 m above base 31.41 0.03 0.04 206Pb/238U 145.8, equivalent to GSSP), northeastern Apennines, Italy 12 28003.83vE of section MCA/84-3 Pg34 biotite-rich layer; MCA- Monte Cagnero section (Chattian 43 38047.81vN, Scaglia Cinerea Fm, 142.8 m above base 31.72 0.02 0.04 206Pb/238U 142.8 GSSP), northeastern Apennines, Italy 12 28003.83vE of section Eocene Priabonian Pg33 Pg19 biotite-rich layer; MASS- Massignano (Oligocene GSSP), near 43.5328 N, Scaglia Cinerea Fm, 14.7 m above base of 34.50 0.04 0.05 206Pb/238U 14.7, equivalent to Ancona, northeastern Apennines, 13.6011 E section MAS/86-14.7 Italy Pg32 biotite-rich layer; MASS- Massignano (Oligocene GSSP), near 43.5328 N, Scaglia Cinerea Fm, 12.9 m above base of 34.68 0.04 0.06 206Pb/238U 12.9 Ancona, northeastern Apennines, 13.6011 E section Italy Pg31 Pg18 biotite-rich layer; MASS- Massignano (Oligocene GSSP), near 43.5328 N, Scaglia Cinerea Fm, 12.7 m above base of 34.72 0.02 0.04 206Pb/238U 12.7, equivalent to Ancona, northeastern Apennines, 13.6011 E section MAS/86-12.7 Italy Pg30 biotite-rich layer; MASS- Massignano (Oligocene GSSP), near 43.5328 N, Scaglia Variegata Fm, 8.0 m above base 35.28 0.03 0.05 206Pb/238U 12.9 Ancona, northeastern Apennines, 13.6011 E of section Italy Pg29 biotite-rich layer; MASS- Massignano (Oligocene GSSP), near 43.5328 N, Scaglia Variegata Fm, 7.2 m above base 35.34 0.03 0.05 206Pb/238U 12.9 Ancona, northeastern Apennines, 13.6011 E of section Italy Pg28 biotite-rich layer; MASS- Massignano (Oligocene GSSP), near 43.5328 N, Scaglia Variegata Fm, 6.5 m above base 35.40 0.03 0.05 206Pb/238U 12.9 Ancona, northeastern Apennines, 13.6011 E of section Italy Pg27 biotite-rich layer; MASS- Massignano (Oligocene GSSP), near 43.5328 N, Scaglia Variegata Fm, 5.8 m above base 35.47 0.03 0.05 206Pb/238U 12.9 Ancona, northeastern Apennines, 13.6011 E of section Italy Bartonian Lutetian Pg26 Pg17 Mission Valley ash, La Mesa, California B33N, 117W terrestrial facies of Mission Valley Fm 43.35 6 0.50 6 0.50 40Ar/39Ar SDSNH Loc. 3428 Pg25 Pg16 DSDP Hole 516F DSDP Hole 516F 30 16.590S, 46.24 6 0.50 6 0.50 40Ar/39Ar 35 17.100W Ypresian Pg24 Pg15 68-0-51, 3497; Blue Two-Ocean Plateau and Irish Rock B44N, 109W overlies Aycross Fm 48.41 6 0.21 6 0.21 40Ar/39Ar Point Marker ash locales, Absaroka volcanic province, western USA Pg23 Pg14 CP-1; Continental Peak Bridger Basin, western USA 42 16006.2vN, Bridger Fm 48.96 6 0.28 6 0.33 40Ar/39Ar tuff 108 4307.5vW Appendix 2 1287 Primary radioisotopic age details Zonal range assignment Biostratigraphy Reference clade zonation Zone Weighted mean age of 5 (of 8 with 2 older and 1 Plank. foraminifera; calc. upper Zone O5; lower upper Zone O5; lower NP25; magnetostratigraphic Sahy et al. (2017); Coccioni younger) single zircon crystal analyses, utilizing CA- nannoplankton NP25 control at top of Chron C9n.2n et al. (2008) TIMS and the ET535 spike. Weighted mean age of 6 (of 7 with 1 older) single Plank. foraminifera; calc. middle Zone O2; middle middle Zone O2; mid NP23; magnetostratigraphic Sahy et al. (2017); Coccioni zircon crystal analyses, utilizing CA-TIMS and the nannoplankton NP23 control at upper Chron 12r et al. (2008) ET535 spike. Weighted mean age of 4 (of 5 with 1 younger) single Plank. foraminifera; calc. middle Zone O2; middle middle Zone O2; mid NP23; magnetostratigraphic Sahy et al. (2017); Coccioni zircon crystal analyses, utilizing CA-TIMS and the nannoplankton NP23 control at upper Chron 12r et al. (2008) ET535 spike. Weighted mean age of 3 (of 7 with 4 older) single Plank. foraminifera; calc. lowermost NP21, lowermost NP21, lowermost CP16a; Sahy et al. (2017); Odin zircon crystal analyses, utilizing CA-TIMS and the nannoplankton lowermost CP16a magnetostratigraphic control in lower Chron 13r et al. (1991) ET535 spike. Weighted mean age of 3 (of 3) single zircon crystal Plank. foraminifera; calc. uppermost NP19/20, uppermost NP19/20, uppermost CP15b; Sahy et al. (2017); Odin analyses, utilizing CA-TIMS and the ET535 spike. nannoplankton uppermost CP15b magnetostratigraphic control near base of Chron 13r et al. (1991) Weighted mean age of 7 (of 10 with 3 older) single Plank. foraminifera; calc. uppermost NP19/20, uppermost NP19/20, uppermost CP15b; Sahy et al. (2017); Odin zircon crystal analyses, utilizing CA-TIMS and the nannoplankton uppermost CP15b magnetostratigraphic control near base of Chron 13r et al. (1991) ET535 spike. Weighted mean age of 7 (of 12 with 5 older) single Plank. foraminifera; calc. lower NP19/20, lower lower NP19/20, lower CP15b; magnetostratigraphic Sahy et al. (2017); Odin zircon crystal analyses, utilizing CA-TIMS and the nannoplankton CP15b control in C15r et al. (1991) ET535 spike. Weighted mean age of 5 (of 7 with 2 older) single Plank. foraminifera; calc. lower NP19/20, lower lower NP19/20, lower CP15b; magnetostratigraphic Sahy et al. (2017); Odin zircon crystal analyses, utilizing CA-TIMS and the nannoplankton CP15b control in C15r et al. (1991) ET535 spike. Weighted mean age of 6 (of 10 with 4 older) single Plank. foraminifera; calc. lower NP19/20, lower lower NP19/20, lower CP15b; magnetostratigraphic Sahy et al. (2017); Odin zircon crystal analyses, utilizing CA-TIMS and the nannoplankton CP15b control in C16n.1n et al. (1991) ET535 spike. Weighted mean age of 6 (of 9 with 3 older) single Plank. foraminifera; calc. lower NP19/20, lower lower NP19/20, lower CP15b; magnetostratigraphic Sahy et al. (2017); Odin zircon crystal analyses, utilizing CA-TIMS and the nannoplankton CP15b control in C16n.1n et al. (1991) ET535 spike. Laser fusion single-crystal sanidine analyses, originally Plank. foraminifera; calc. NP16, CP14a coccoliths Reticulofenestra umbilica (Levin) and Obradovich, unpublished calibrated to TCs 5 28.32 Ma; no analytical data nannoplankton Discoaster distinctus Martini; magnetostratigraphic data cited in Walsh et al. published. control (1996) Laser fusion of biotite and sanidine separates, no Plank. foraminifera; calc. NP15, CP10 NP15, CP10; magnetostratigraphic control Swisher and Montanari, in analytical data published. nannoplankton prep, cited in Berggren et al. (1995) (postscript) Weighted mean of multi-grain feldspar (46.8% of gas) magnetostratigraphy magnetostratigraphic control Hiza (1999); Flynn (1986) and multi-grain hornblende (98.7% of gas) incremental heating plateau ages, originally calibrated using FCs 5 27.84 Ma. Weighted mean age of 12 (of 16) laser fusion analyses magnetostratigraphy magnetostratigraphic control Smith et al. (2008); Clyde on small multi-grain aliquots of sanidine, using FCs as et al. (2001) fluence monitor. 1288 Appendix 2 GTS GTS Sample Locality Lat-Long Lithostratigraphy Age 6 2s 6 2s Age Type 2020 2012 (Ma) analytical total ID ID Period Epoch Age Pg22 Pg15 GR-416; Sixth tuff Green River Basin, western USA 41 32031.1vN, uppermost Wilkins Peak Member, Green 49.69 6 0.05 6 0.07 206Pb/238U 109 28052.9vW River Fm Pg21 Pg3 Upper Willwood ash; Bighorn Basin, western USA 42 16006.2vN, Willwood Fm 52.93 6 0.23 6 0.23 40Ar/39Ar bed B 108 4307.5vW Pg20 Pg12 Ash-17 DSDP Site 550, north Atlantic 48 30.910N, 55.48 6 0.12 6 0.12 40Ar/39Ar 13 26.370W Pg19 Pg11 SB01-01 bentonite Longyearbyen section, Spitsbergen, B7809010vN, 10.9 m above base of the Gilsonryggen 55.785 6 0.034 6 0.075 206Pb/238U Svalbard Archipeligo 15 01038vE Member, Frysjaodden Fm, within the PETM carbon isotope excursion Paleocene Thanetian Selandian Pg18 Pg10 Belt Ash Southeast Polecat Bench section, 44 51.50N, Silver Coulee beds, Fort Union Fm 59.39 6 0.30 6 0.30 40Ar/39Ar northern Bighorn Basin, Wyoming, 108 45.10W USA Danian Pg17 volcanic tuff in Kiowa Kiowa core, Elbert County 39.35242N, 174.52 m below top of core; D1 sequence 64.52 6 0.03 6 0.08 206Pb/238U core, KJ08-17 Fairgrounds, Kiowa, Colorado 104.46642 W of fluvial/paludal sandstone, mudstone, and lignite beds Pg16 volcanic tuff in Kiowa Kiowa core, Elbert County 39.35242N, 179.26 m below top of core; D1 sequence 64.63 6 0.05 6 0.09 206Pb/238U core, KJ07-63 Fairgrounds, Kiowa, Colorado 104.46642 W of fluvial/paludal sandstone, mudstone, and lignite beds Pg15 U coal tephra Biscuit Butte locality, Garfield 47 29013.1vN, base of Lebo Member of the Fort Union 64.66 6 0.05 6 0.09 40Ar/39Ar County, eastern Montana 107 407.6vW Formation Pg14 V coal tephra Biscuit Butte locality, Garfield 47 29021.8vN, above the Farrand Channel, upper 64.84 6 0.05 6 0.09 40Ar/39Ar County, eastern Montana 107 4023.8vW Tulloch Member of the Fort Union Formation Pg13 W coal tephra Saddle Section locality, Garfield 47 30034.8vN, below the Farrand Channel, upper 64.91 6 0.05 6 0.10 40Ar/39Ar County, eastern Montana 107 4054.9vW Tulloch Member of the Fort Union Formation Pg12 X coal tephra McGuire Creek locality, McCone 47 37047.5vN, capping the Garbani Channel, upper 65.29 6 0.06 6 0.11 40Ar/39Ar County, eastern Montana 106 10012.4vW Tulloch Member of the Fort Union Formation Pg11 Y coal tephra Hell Hollow locality, Garfield 47.53472N,
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    % {I V 0> % rF h y Catalog of Type Specimens Compiled Frederick J. Collier of Invertebrate Fossils: Conodonta SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY NUMBER 9 SERIAL PUBLICATIONS OF THE SMITHSONIAN INSTITUTION The emphasis upon publications as a means of diffusing knowledge was expressed by the first Secretary of the Smithsonian Institution. In his formal plan for the Insti­ tution, Joseph Henry articulated a program that included the following statement: "It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge." This keynote of basic research has been adhered to over the years in the issuance of thousands of titles in serial publications under the Smithsonian imprint, com­ mencing with Smithsonian Contributions to Knowledge in 1848 and continuing with the following active series: Smithsonian Annals of Flight Smithsonian Contributions to Anthropology Smithsonian Contributions to Astrophysics Smithsonian Contributions to Botany Smithsonian Contributions to the Earth Sciences Smithsonian Contributions to Paleobiology Smithsonian Contributions to Zoology Smithsonian Studies in History and Technology In these series, the Institution publishes original articles and monographs dealing with the research and collections of its several museums and offices and of profes­ sional colleagues at other institutions of learning. These papers report newly acquired facts, synoptic interpretations of data, or original theory in specialized fields. These publications are distributed by mailing lists to libraries, laboratories, and other in­ terested institutions and specialists throughout the world. Individual copies may be obtained from the Smithsonian Institution Press as long as stocks are available.
  • Records from the Aalenian–Bajocian of Patagonia (Argentina): an Overview

    Records from the Aalenian–Bajocian of Patagonia (Argentina): an Overview

    Geol. Mag.: page 1 of 11. c Cambridge University Press 2013 1 doi:10.1017/S0016756813000058 Ophthalmosaurian (Ichthyosauria) records from the Aalenian–Bajocian of Patagonia (Argentina): an overview ∗ MARTA S. FERNÁNDEZ † & MARIANELLA TALEVI‡ ∗ División Palaeontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina. CONICET ‡Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, 8332 General Roca, Río Negro, Argentina. CONICET (Received 12 September 2012; accepted 11 January 2013) Abstract – The oldest ophthalmosaurian records worldwide have been recovered from the Aalenian– Bajocian boundary of the Neuquén Basin in Central-West Argentina (Mendoza and Neuquén provinces). Although scarce, they document a poorly known period in the evolutionary history of parvipelvian ichthyosaurs. In this contribution we present updated information on these fossils, including a phylogenetic analysis, and a redescription of ‘Stenopterygius grandis’ Cabrera, 1939. Patagonian ichthyosaur occurrences indicate that during the Bajocian the Neuquén Basin palaeogulf, on the southern margins of the Palaeopacific Ocean, was inhabited by at least three morphologically discrete taxa: the slender Stenopterygius cayi, robust ophthalmosaurian Mollesaurus periallus and another indeterminate ichthyosaurian. Rib bone tissue structure indicates that rib cages of Bajocian ichthyosaurs included forms with dense rib microstructure (Mollesaurus) and forms with an ‘osteoporotic-like’ pattern (Stenopterygius cayi). Keywords: Mollesaurus,‘Stenopterygius grandis’, Middle Jurassic, Neuquén Basin, Argentina. 1. Introduction all Callovian and post-Callovian ichthyosaurs, two different Early Jurassic taxa have been proposed as Ichthyosaurs were one of the main predators in the ophthalmosaurian sister taxa: Stenopterygius (Maisch oceans all over the world during most of the Mesozoic & Matzke, 2000; Sander, 2000; Druckenmiller & (Massare, 1987).