Where: Wyoming (43.8° N, 110.9° W: paleocoordinates 2.2° N, 40.4° W)
• coordinate based on political unit
When: Ranchester Limestone Member (Amsden Formation), Chesterian (339.4 - 318.1 Ma)
• "Upper Miss. (latest Chester)"
Environment/lithology: shallow subtidal; cherty/siliceous dolomite
Primary reference: J. J. Sepkoski Jr. 1998. Rates of speciation in the fossil record. Philosophical Transaction of the Royal Society Biological Sciences 353(1366):315-326 [J. Sepkoski/M. Sommers/A. Clement] more details
PaleoDB collection 585: authorized by Arnold Miller, entered by Mike Sommers on 19.01.1999, edited by Pete Wagner