USGS 13403, Okolona (Cretaceous of the United States)

Where: Clark County, Arkansas (34.0° N, 93.4° W: paleocoordinates 38.0° N, 65.0° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Nostoceras hyatti ammonoid zone, Saratoga Chalk Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• Was early Maastrichtian, updated by Kennedy and Cobban to late Campanian

• bed-level stratigraphic resolution

Environment/lithology: chalk

Size class: macrofossils

Collected by L.W. Stephenson, C.H. Dane; 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 197643: 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