Pre-Lance and post-Cody formations change from non-marine in the southwestern part of the Big Horn basin to largely marine shales in the northeastern part. In the southwestern part of the basin the stratigraphic section includes the Mesaverde and Meeteetse Formations and their correlatives in the northeastern part are the Eagle Sandstone, Claggett Shale, Judith River Formation, and Bearpaw Shale. Marine and transitional environments have produced sandstone reservoirs and petroleum accumulations in the Eagle, Judith River, and Bearpaw of the Big Horn basin.

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