Where: Uvalde County, Texas (29.2° N, 100.1° W: paleocoordinates 34.9° N, 73.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Austin Chalk Formation, Early/Lower Campanian (83.5 - 70.6 Ma)

• Upper layer of Austin Chalk. W. B. Clark thought it came from the Washita group (Lower Cretaceous). Nothing like it has been found in the Washita, but several specimens that apparently represent this species came from the Austin chalk and the Anacacho limestone. Early Campanian age based on well-dated specimens elsewhere.

• bed-level stratigraphic resolution

Environment/lithology: chalk

Size class: macrofossils

Collected by R.T. Hill; reposited in the USNM

Primary reference: C. W. Cooke. 1953. American Upper Cretaceous Echinoidea. United States Geological Survey Professional Paper 254-A:1-44 [W. Kiessling/U. Merkel/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 78201: authorized by Wolfgang Kiessling, entered by Uta Merkel on 31.01.2008

Creative Commons license: CC BY (attribution)