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Fossils from the Middle Jurassic Wanakah formation near Delta in western Colorado

Scientific Investigations Report 2006-5105

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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.

Geospatial Extents

Additional Publication Details

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
Edition:
Version 1.0
Year Published:
2006
Language:
ENGLISH
Description:
iii, 6 p.
Number of Pages:
9
Online Only (Y/N):
Y