Gray's Quarry, Hamilton, Hancock Co., Illinois (Carboniferous to of the United States)

Where: Hancock County, Illinois (40.4° N, 91.3° W: paleocoordinates 15.1° S, 35.4° W)

• coordinate based on nearby landmark

When: Gnathodus texanus conodont zone, Keokuk Limestone Formation, Chadian to Chadian (346.7 - 340.0 Ma)

• JA: entered as Mississippian, but the Keokuk Limestone falls entirely within the Chadian to Arundian Gnathodus texanus zone (Work and Mason 2004)

Environment/lithology: marine

• no litho info given

Primary reference: W. I. Ausich and T. W. Kammer. 1991. Systematic revisions to Aorocrinus, Dorycrinus, Macrocrinus, Paradichocrinus, Strotocrinus, and Uperocrinus: Mississippian camerate crinoids (Echinodermata) from the stratotype region. Journal of Paleontology 65(6):936-944 [J. Alroy/M. Sommers/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 718: authorized by John Alroy, entered by Mike Sommers on 02.03.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• list is only of crinoid material now known from this new location.
Show authors, comments, and common names
Crinoidea
 Monobathrida - Batocrinidae
Macrocrinus mundulus
Macrocrinus mundulus Hall 1859 Sea lily