--> Abstract: Biofacies Analysis of Uppermost Hamlin Shale and Americus Limestone (Permian, Wolfcampian) in Northeast Kansas, by R. M. Peterson; #90974 (1975).
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Abstract: Biofacies Previous HitAnalysisNext Hit of Uppermost Hamlin Shale and Americus Limestone (Permian, Wolfcampian) in Northeast Kansas

R. M. Peterson

The recognition of ancient shorelines often is critical to development of a sound Previous HitpaleoenvironmentalTop framework, and the finding of such shorelines can be useful in the search for petroleum. Clear evidence of shoreline deposits has been found in the Lower Permian (Wolfcampian) deposits of Kansas east of the Nemaha ridge. These deposits are in the uppermost Hamlin Shale Member of the Janesville Shale of the Admire Group.

Features of these rocks include intertidal and supratidal carbonate rocks with fenestral fabrics, possible columnar algal stromatolites, desiccation features, small amounts of gypsum, and absence of a typical marine macroinvertebrate fauna. Associated with these are lagoonal shales and mudstones and presumed terrestrial conglomeratic claystones and mudstones. Our research, preliminary results of which are now available, documents the changes in diversity, composition, and distribution of the assemblages of ostracod and foraminiferal microfossils.

APG Search and Discovery Article #90974©1975 AAPG Mid-Continent Section Meeting, Wichita, Kansas