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The AAPG/Datapages Combined Publications Database
Wyoming Geological Association
Abstract
Depositional Environments and Diagenesis of the Bear River Formation, Western Wyoming
Abstract
The Lower Cretaceous (Albian) Bear River Formation of the Wyoming Overthrust Belt can be subdivided into seven informal units for the purpose of description and environmental classification. These units and the environments they are interpreted to represent are: (1) interbedded mudstone, marlstone, and siltstone — coastal plain; (2) dark gray shale — offshore marine; (3) interbedded shale and siltstone — offshore-shoreface transition; (4) low-angle cross-stratified sandstone — lower shoreface; (5) trough cross-stratified sandstone — upper shoreface; (6) interbedded siltstone, fossiliferous limestone, and carbonaceous shale — coastal swamp and lagoon; (7) dark gray shale — offshore marine.
Bear River sandstones are typically fine-grained chert arenites. Silica, calcite, and kaolinite are the most abundant cements. The diagenetic chronology is (1) precipitation of early calcite cement; (2) formation of silica overgrowths; (3) precipitation of pore-filling kaolinite; (4) precipitation of late calcite cement, (5) replacement of calcite by dolomite and (6) precipitation of late quartz cement.
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