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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The record of Paleozoic sedimentation in Montana and adjacent states and provinces reveals the influence of the tectonic framework of the area on the lithologic character, distribution, and thickness of the systems. Isopach and lithofacies maps of each system are presented, with interpretations of the positions and times of activity of positive and negative elements. The study indicates that the complex Cordilleran geosyncline, Williston basin, Central Montana trough, and Wyoming shelf areas were important factors in controlling sedimentation by their tectonic behavior during deposition. The Sweetgrass arch appears to have had little influence during sedimentation, but pre-Middle Devonian and pre-Middle Jurassic uplift and erosion of the element broadly affected the prese t distribution and thickness of Paleozoic systems.
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