Where: Medina County, Texas (29.4° N, 99.2° W: paleocoordinates 32.7° N, 69.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Austin Chalk Formation, Santonian (86.3 - 83.6 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: chalk

Size class: macrofossils

Collected by N.H. Darton; 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 197705: authorized by Matthew Clapham, entered by Matthew Clapham on 22.11.2018

Creative Commons license: CC BY (attribution)