Mesozoic Mammals from Arizona: New Evidence on Mammalian Evolution

  title={Mesozoic Mammals from Arizona: New Evidence on Mammalian Evolution},
  author={F. Jenkins and A. Crompton and W. Downs},
  pages={1233 - 1235}
  • F. Jenkins, A. Crompton, W. Downs
  • Published 1983
  • Biology, Medicine
  • Science
  • Knowledge of early mammalian evolution has been based on Old World Late Triassic-Early Jurassic faunas. The discovery of mammalian fossils of approximately equivalent age in the Kayenta Formation of northeastern Arizona gives evidence of greater diversity than known previously. A new taxon documents the development of an angular region of the jaw as a neomorphic process, and represents an intermediate stage in the origin of mammalian jaw musculature. 
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