Minturn Formation Fossils
The Minturn Formation is Pennsylvanian (Upper Atokan to Desmoinesian)
It has a diverse fauna, consisting mostly of marine invertebrates.
Some land plants are also found.
The fossils shown here were found near the towns of McCoy and Bond
in Eagle County, Colorado.
The best reference for the brachiopods is C. H. Stevens, 1962, Stratigraphic
significance of Pennsylvanian brachiopods in the McCoy area, Colorado,
Journal of Paleontology, vol. 36, pp. 617-629.
The best reference for the crinoids is G. D. Webster and Karen J. Houck, 1998, Middle
Pennsylvanian, late Atokan-early Desmoinesian echinoderms from an intermontane
basin, the Central Colorado Trough, Journal of Paleontology, vol. 72, pp. 1054-1072.
Since the fauna is similar to middle Pennsylvanian marine faunas in other parts of North
America, I have found R. D. Hoare, 1961, Desmoinesian Brachiopoda and Mollusca from
Southwest Missouri (Univ. Missouri Studies Vol. XXXVI) and
Fossils of Ohio, 1996, (Bulletin 70, Ohio Division of Geological Survey)
to be useful for identifying my specimens.
The stratigraphic units to which I refer in the descriptions of indvidual specimens
are defined in K. Houck, 1997, Effects of sedimentation, tectonics, and
glacial-eustasy on depositional sequences, Pennsylvanian Minturn Formation, North-Central
Colorado, AAPG Bulletin, vol. 81, pp. 1510-1533.
Click on the links below to view the specimens.
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Last modified: February 19, 2002. Send comments to