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Uranium in the Cochetopa District, Colorado, in relation to the Oligocene erosion surface

January 1, 1976

In the Cochetopa district, Colorado, the sequence of Mesozoic and Cenozoic events is as follows: development of a relatively smooth, planar erosion surface in Jurassic time; deposition, on this surface, of the Junction Creek Sandstone and Morrison Formation of Jurassic age, followed by deposition of the Dakota Sandstone and Mancos Shale of Cretaceous age; Laramide tilting and faulting; erosion to form a terrane of moderate relief in Oligocene time; deposition of lava flows and volcanic breccia of intermediate composition and of ash-flow tuff, all of Oligocene age; and subsequent erosion and canyon-cutting by Cochetopa Creek, a superimposed stream, and its tributaries.

Publication Year 1976
Title Uranium in the Cochetopa District, Colorado, in relation to the Oligocene erosion surface
DOI 10.3133/ofr76222
Authors Jerry Chipman Olson
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 76-222
Index ID ofr76222
Record Source USGS Publications Warehouse