Compsocrinus-Dendrocrinus Association of the Bear Creek Shale (Silurian of the United States)

Where: Wayne County County, New York (43.1° N, 77.1° W: paleocoordinates 24.8° S, 46.6° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Bear Creek Shale Formation, Llandovery (443.4 - 433.4 Ma)

• Upper beds of Bear Creek Shale

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, gray, green shale

• The association of this crinoid with abundant Eocoelia hemispherica indicates BA 2 (shallowest subtidal range). The Bear Creek Shale clearly lies shoreward of the BA 3 Wallington Limestone and represents and inner shelf, low-energy mud bottom environment.
• Sparsely to abundantly fossiliferous dark greenish gray to dusky purple shales, with some bedding planes covered with mainly disarticulated valves of Eocoelia.

Preservation: cast

Primary reference: T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 13290: authorized by Michael Foote, entered by Kimberly Koverman on 14.02.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Crinoidea
 Monobathrida - Tanaocrinidae
Compsocrinus relictus
 Diplobathrida - Dimerocrinitidae
? Ptychocrinus sp.
? Ptychocrinus sp. Wachsmuth and Springer 1885 Sea lily
 Dendrocrinida - Dendrocrinidae
Dendrocrinus ursae
Rhynchonellata
 Rhynchonellida - Leptocoeliidae
Eocoelia hemispherica