USGS 15502, San Antonio Road (Cretaceous of the United States)

Where: Bexar County, Texas (29.4° N, 98.8° W: paleocoordinates 35.1° N, 77.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Corsicana Marl Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; marl

Size class: macrofossils

Collected by L.W. Stephenson; 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: paleoecologic analysis

PaleoDB collection 197652: authorized by Matthew Clapham, entered by Matthew Clapham on 19.11.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Echinoidea
 Spatangoida - Hemiasteridae
Hemiaster wetherbyi de Loriol 1887 heart urchin
 Spatangoida - Micrasteridae
Micraster americanus Stephenson 1941 heart urchin
 Spatangoida - Schizasteridae
Proraster dalli Clark 1891 heart urchin