Triassic environments, climates and reptile evolution

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Abstract

A consideration of all the available data on Triassic vertebrate faunas, and their stratigraphic location reveals a relatively sudden extinction event among the last of the mammal-like reptiles and the herbivorous rhynchosaurs in the Norian of the Upper Triassic. This event was apparently quickly followed by the radiation of the dinosaurs, also in the Norian. This conclusion suggests that competition was not the main factor in the initial success of the dinosaurs, but opportunistic radiation following the extinction of major reptile groups. A global review of Triassic sedimentary facies shows that there were climatic and floral changes towards the end of the Triassic. It is envisaged that increasing aridity in the later Triassic, resulting from plate motions and particularly affecting Gondwanaland and southwestern Laurasia, brought about floral changes and then the reptile extinctions. With the rapid evolution of new floras of conifers and bennettitaleans, the dinosaurs came to dominate all terrestrial faunas within the space of only a few million years.

References (72)

  • R.T. Bakker

    Dinosaur physiology and the origin of mammals

    Evolution

    (1971)
  • R.T. Bakker

    Dinosaur renaissance

    Sci. Am.

    (1975)
  • R.T. Bakker

    Dinosaur heresy — dinosaur renaissance: why we need endothermic archosaurs for a comprehensive theory of bioenergetic evolution

  • P.D.W. Barnard

    Mesozoic floras

  • M.J. Benton

    Ectothermy and the success of dinosaurs

    Evolution

    (1979)
  • M.J. Benton

    Dinosaur success in the Triassic: a non-competitive ecological model

    Q. Rev. Biol.

    (1983)
  • N.J. Beukes

    Stratigraphy and sedimentology of the Cave Sandstone Stage, Karroo System

  • J.F. Bonaparte

    Datos sobre la evolucion paleoecologica en las formaciones triasicas de Ischigualasto—Villa Union

    Acta Geol. Lilloana

    (1969)
  • J.F. Bonaparte

    El Mesozoico de América del Sur y sus Tetrápodos

    Opera Lilloana

    (1978)
  • C.A. Bortoluzzi et al.

    The Santa Maria beds in Rio Grande do Sul (Brazil)

  • A.J. Charig

    The evolution of the archosaur pelvis and hindlimb: an explanation in functional terms

  • A.J. Charig

    Differentiation of lineages among Mesozoic tetrapods

    Mem. Soc. Géol. Fr.

    (1980)
  • L.B. Clemmensen

    Triassic lacustrine red beds and palaeoclimate: the Buntsandstein of Helgoland and the Malmros Klint Member of East Greenland

    Geol. Rundsch.

    (1979)
  • E.H. Colbert

    Triassic life in the south-western United States

    Trans. N.Y. Acad. Sci.

    (1948)
  • E.H. Colbert

    Continental drift and the distributions of fossil reptiles

  • E.H. Colbert

    The Triassic paleontology of Ghost Ranch

  • E.H. Colbert

    Early Triassic tetrapods and Gondwanaland

    Mém. Mus. Natl. Hist. Nat., A

    (1975)
  • J.W. Collinson et al.

    Triassic fluvial depositional systems in the Fremouw Formation, Cumulus Hills, Antarctica

  • B. Cornet et al.

    Palynological contributions to the chronology and stratigraphy of the Hartford Basin in Connecticut and Massachusetts

    Geosci. Man.

    (1975)
  • C.B. Cox

    Changes in terrestrial vertebrate faunas during the Mesozoic

  • C.B. Cox

    Triassic tetrapods

  • C.B. Cox

    Gondwanaland Triassic stratigraphy

    An. Acad. Bras., Ciênc.

    (1973)
  • A.R.I. Cruickshank

    Feeding adaptations in Triassic dicynodonts

    Palaeontol. Afr.

    (1978)
  • D.H. Elliot et al.

    Triassic tetrapods from Antarctica: evidence for continental drift

    Science

    (1970)
  • A.S. Gottesfeld

    Paleoecology of the lower part of the Chinle Formation

    Mus. N. Ariz. Bull.

    (1972)
  • F.E. Grine et al.

    Evidence for salt glands in the Triassic reptile Diademodon (Therapsida, Cynodontia)

    Palaeontol. Afr.

    (1979)
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    1

    Present address: Department of Geological Sciences, University of Durham, Durham, DH1 3LE (United Kingdom).

    2

    Present address: University Museum, Parks Road, Oxford, OX1 3PW (United Kingdom).

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