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Late Triassic Terrestrial Tetrapods: Biostratigraphy, Biochronology and Biotic Events

  • Spencer G. LucasEmail author
Chapter
Part of the Topics in Geobiology book series (TGBI, volume 46)

Abstract

The fossil record of Late Triassic tetrapods can be organized biostratigraphically and biochronologically into five, temporally successive land-vertebrate faunachrons (LVFs) that encompass Late Triassic time (in ascending order): Berdyankian, Otischalkian, Adamanian, Revueltian and Apachean. An up-to-date review of the age constraints on Late Triassic tetrapod fossil assemblages and correlation within the framework of the LVFs is presented. This makes possible a much more accurate evaluation of the timing of biotic events of Late Triassic tetrapod evolution, including: (1) Otischalkian, HO (highest occurrence) of almasaurids and chroniosuchians?, LOs (lowest occurrences) of crocodylomorphs and dinosaurs; (2) Adamanian, HO of mastodonsaurids and trematosaurids, LO of mammals; (3) Revueltian, HOs of capitosaurids, rhynchosaurs and dicynodonts; and (4) Apachean, HOs of metoposaurids, plagiosaurids and aetosaurs. The LO of turtles is Early Triassic or older, and the HO of phytosaurs is an Early Jurassic record. There is no compelling evidence of tetrapod mass extinctions at either the Carnian-Norian or the Triassic-Jurassic boundaries.

Keywords

Late Triassic Tetrapods Berdyankian Otischalkian Adamanian Revueltian Apachean Dinosaurs Extinctions 

Notes

Acknowledgments

I thank many colleagues for access to specimens in museum collections and/or for assistance in the field. I am particularly grateful to Jaime Powell for access to the Neoatosauroides fossils in Tucuman, Argentina. Andy Heckert, Adrian Hunt and Larry Tanner have collaborated extensively with me in the field studying Late Triassic rocks and fossils, and they have taught me much. Adrian Hunt and Julien Kimmig provided helpful reviews of the manuscript.

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© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.New Mexico Museum of Natural History and ScienceAlbuquerqueUSA

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