Abstract
After truncation of the Mississippian sediments, much of the present state of Wyoming was titled south. Pennsylvanian seas advanced onto the shelf area of Wyoming from both the southwest and southeast. In the southeastern part of the state, a hinge line developed in the vicinity of the Hartville area. This hinge line separated a basin deep in eastern Colorado from a more stable, restricted bay or gulf which occupied much of eastern Wyoming. In this bay an entire sequence of Permo-Pennsylvanian sediments accumulated. The bay appears to have occupied an area very similar in outline to the present-day structural configuration of the Powder River basin.
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