Biostratigraphic Classification of the Marine Triassic in North America

Silberling, Norman J.; Tozer, E. T.

doi:10.1130/spe110-p1

Cited by 111 publications

(125 citation statements)

References 4 publications

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“…2). The co-occurrence of the Anasibirites ammonoid fauna with the fishes constrains the age of the new ichthyofauna to the late Smithian (Brühwiler et al 2010, Silberling & Tozer 1968. This age determination is confirmed by the presence of the conodont Scythogondolella milleri within the same layer.…”

Section: Geological Settingmentioning

confidence: 48%

Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution

Romano¹,

Kogan²,

Jenks³

et al. 2012

Bull. Geosci.

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A new marine fish assemblage from the late Smithian (Olenekian, Early Triassic) Anasibirites beds of the Thaynes Formation collected near Georgetown (Bear Lake County, south-east Idaho, USA) comprises actinopterygians (Saurichthys cf. elongatus, Actinopterygii indet.), sarcopterygians (Actinistia indet.), and possibly chondrichthyans. We review the global fossil record of the Triassic lower actinopterygian Saurichthys, which is used herein for a case study of trends in morphological adaptations as well as variations in palaeogeographic distribution and diversity dynamics of Early Mesozoic fishes. In the Early Triassic, Saurichthys already occupied a top position in marine food webs, with some species achieving body lengths of up to 1.5 m. Distribution of morphological characters in Saurichthys during the Triassic suggests trends towards a reduction in squamation, stiffening of the fins and axial skeleton, shortening of the postorbital portion of the cranium, and reduction in the number of dermal skull bones. The postcranial adaptations in particular helped to improve the fast-start ability of these ambush predatory fishes. The palaeogeographic range of Saurichthys changed from a virtually global distribution in the Early Triassic (indicating rapid dispersal within marine and freshwater ecosystems after the end-Permian mass extinction) to an occurrence mainly restricted to the north-western Tethys in the Late Triassic, and also towards increasing rarity within continental deposits. Modifications in the palaeogeographic distribution were accompanied by successive loss in global species richness and were possibly related to intra-Triassic extinction events, environmental alterations and/or competition. •

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Section: Geological Settingmentioning

confidence: 48%

Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution

Romano¹,

Kogan²,

Jenks³

et al. 2012

Bull. Geosci.

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“…Hyatt (1892) and Cox (1949) regarded Rhabdoceras as an age indicator for the Norian (see also Thenius, 1980). Siberling and Tozer (1968) (Krumbeck, 1921).…”

Section: Discussionmentioning

confidence: 99%

The Triassic Marine Biota of Eastern Indonesia and its Interregional and Global Correlation: A Review

Hasibuan¹

2010

Indonesian J. Geosci.

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“…and the Prida Formation in Nevada (Silberling & Wallace 1969;Bucher 1989; this work), as well as in the Luolou Formation in China (Galfetti et al 2007a;this work). Several authors (Silberling & Tozer 1968;Bucher 1989;Tozer 1994a) considered that the haugi Zone correlates with the high-palaeolatitudinal Keyserlingites subrobustus Zone. Although this point of view has been questioned (Waterhouse 1999), the ammonoid faunas recently documented by Guex et al (2010) corroborate this hypothesis again.…”

Section: Biostratigraphymentioning

confidence: 99%

“…The standard biochronological scheme of Spathian and Anisian in North America was produced by Silberling & Tozer (1968), Silberling & Wallace (1969), Bucher (1989), Tozer (1994b), and Monnet & Bucher (2005a). Monnet & Bucher (2005b) analysed the biochronology and biodiversity of Anisian ammonoid faunas from Nevada and British Columbia.…”

Section: Biostratigraphymentioning

confidence: 99%

Globacrochordicerasgen. nov. (Acrochordiceratidae, late Early Triassic) and its significance for stress-induced evolutionary jumps in ammonoid lineages (cephalopods)

Monnet¹,

Bucher

Brayard

et al. 2013

Fossil Record

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Biostratigraphic Classification of the Marine Triassic in North America

Cited by 111 publications

References 4 publications

Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution

Saurichthys and other fossil fishes from the late Smithian (Early Triassic) of Bear Lake County (Idaho, USA), with a discussion of saurichthyid palaeogeography and evolution

The Triassic Marine Biota of Eastern Indonesia and its Interregional and Global Correlation: A Review

Globacrochordicerasgen. nov. (Acrochordiceratidae, late Early Triassic) and its significance for stress-induced evolutionary jumps in ammonoid lineages (cephalopods)

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