Maps of Cenozoic depositional provinces, western United States

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ID: 305810
1961
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Abstract
Major provinces of Cenozoic deposits in western United States were controlled largely by the Cordilleran tectonic framework. As in late Mesozoic time, the principal sites of Cenozoic aggradation were the eastern and western flanks of the Cordillera. In contrast, the axial part received limited deposits throughout much of Cenozoic time, except for accumulation of volcanic debris. In early Cenozoic (Paleocene and Eocene) time, active aggradation prevailed along the western margin of the eugeosynclinal belt (thick marine deposits of the Pacific border) and in the Rocky Mountain miogeosynclinal belt (nonmarine deposits centered in Rocky Mountain basins and spreading across the northern Great Plains). Middle Cenozoic (Oligocene to middle Miocene) time was marked by restricted flooding along the Pacific border and by widespread volcanic-rich nonmarine sedimentation in the central and northern Rocky Mountains and Great Plains. During this interval the axial part of the Cordillera was the site of extensive volcanic deposits - andesitic volcanic debris along the Cascade-Sierra Nevada axis, welded tuff in the Great Basin, and basaltic lava on the Columbia Plateau. Smaller patches of volcanic material accumulated in the Rocky Mountain miogeosynclinal belt. During late Cenozoic (late Miocene and Pliocene) time submergence of the Pacific border was accompanied by deposition of thick marine sequences in actively sinking basins. An extensive volcanic-rich nonmarine mantle continued to accumulate across the eastern Cordillera. The axial part was also the site of widespread volcanic-rich nonmarine sedimentation in many newly formed basins.
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Authors Franklyn B. Van Houten
Journal american journal of science
Year 1961
DOI
10.2475/ajs.259.8.612
URL
https://doi.org/10.2475/ajs.259.8.612
Keywords Keywords not found

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