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Autecology Of Selected Genera Of Mississippian, Permian And Triassic Ammonoids: Analysis Of Coiling Geometries, Edward Ellis Chatelain
Autecology Of Selected Genera Of Mississippian, Permian And Triassic Ammonoids: Analysis Of Coiling Geometries, Edward Ellis Chatelain
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Ammonoids were collected from the Chainman Formation (Mississippian) of southeastern Nevada and southwestern Utah, the Phosphoria Formation (Permian) of southeastern Idaho and westernmost Wyoming, and the Thaynes Formation (Triassic) of northeastern Nevada and southeastern Idaho. The collections are interpreted to represent unwinnowed, untransported death assemblages of ammonoids which were subject to chemical conditions of the nekto-benthic environment. Associated lithologies were sampled and geochemically analyzed for content of phosphate and organic matter. Ammonoid fossil collections, combined with ammonoids illustrated in the literature, were subjected to the graphical W and D analysis of Raup (1967). The basic parameters involved in the description …