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Contributions, May 1997, 31.2

In this issue:

  • A pre-Lancian regional unconformity and its relationship to Hell Creek paleogeography in south-eastern Montana
  • Marine fossils from Permian redbeds (Satanka Shale) at Laramie, Wyoming
  • Silicified gastropods from the Permian Phosphoria rock complex of Wyoming
  • Species diversity, tooth size, and shape of Haplomylus (Condylarthra, Hyopsodontidae) from the Powder River basin, northeastern Wyoming