Uranium in the Cochetopa District, Colorado, in relation to the Oligocene erosion surface
Open-File Report
76-222
By: Jerry Chipman Olson
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Abstract
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.
Suggested Citation
Olson, J.C., 1976, Uranium in the Cochetopa District, Colorado, in relation to the Oligocene erosion surface: U.S. Geological Survey Open-File Report 76-222, 13 leaves :ill., maps ;27 cm., https://doi.org/10.3133/ofr76222.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Uranium in the Cochetopa District, Colorado, in relation to the Oligocene erosion surface |
| Series title | Open-File Report |
| Series number | 76-222 |
| DOI | 10.3133/ofr76222 |
| Year Published | 1976 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | 13 leaves :ill., maps ;27 cm. |