Fossils from the Middle Jurassic Wanakah formation near Delta in western Colorado
Scientific Investigations Report
2006-5105
By: R. B. O'Sullivan, M.A. Carey, and S.C. Good
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Abstract
The Middle Jurassic Wanakah Formation averages about 30 m in thickness in Colorado. Fossils are sparse and include fish, ostracodes, and trace fossils. A thin (0.03-0.45 m) fossil bed near the middle of the formation extends for some 48 km along the northeast flank of the Uncompahgre Plateau near Delta. The fossil bed at one locality contains one pelecypod identified possibly as Modiolus cf. M. subimbricatus (Meek), as well as other specimens too poorly preserved for identification. Previously, Mytilus was found in the same fossil bed at another locality by C.N. Holmes. The Wanakah Formation is primarily of terrestrial origin, but the fossil bed represents a shallow-marine incursion.
Suggested Citation
O'Sullivan, R.B., Carey, M., Good, S., 2006, Fossils from the Middle Jurassic Wanakah formation near Delta in western Colorado (Version 1.0): U.S. Geological Survey Scientific Investigations Report 2006-5105, iii, 6 p., https://doi.org/10.3133/sir20065105.
ISSN: 2328-0328 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Fossils from the Middle Jurassic Wanakah formation near Delta in western Colorado |
| Series title | Scientific Investigations Report |
| Series number | 2006-5105 |
| DOI | 10.3133/sir20065105 |
| Edition | Version 1.0 |
| Year Published | 2006 |
| Language | ENGLISH |
| Description | iii, 6 p. |
| Online Only (Y/N) | Y |