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The AAPG/Datapages Combined Publications Database

Wyoming Geological Association

Abstract


Symposium on Wyoming Tectonics and Their Economic Significance; 23rd Annual Field Conference Guidebook, 1971
Pages 171-178

Stratigraphic Relations of Upper Cretaceous Rocks, Lamont-Bairoil Area, South-Central Wyoming

Mitchell W. Reynolds

Abstract

Unconformities in Upper Cretaceous rocks of southcentral Wyoming mark areas of uplift and erosion, and account for the thinning and absence of the Mesaverde Formation near Lamont and Bairoil. An unconformity at the base of the Teapot Sandstone Member of the Measaverde bevels the underlying part of the Mesaverde from south to north. Local tectonic activity in post-Teapot and early Lewis time resulted in additional uplift and in truncation of the Mesaverde Formation across the area by marine planation. Maximum truncation of strata occurs on the west and north flanks of Lost Soldier anticline, where the Mesaverde is absent; and on the south flank of the Sweetwater arch, where the Mesaverde is absent and the Lewis Shale lies on progressively lower portions of the Cody Shale.


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