Where: Clark County, Arkansas (34.1° N, 93.1° W: paleocoordinates 38.0° N, 64.7° 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; 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 78165: authorized by Wolfgang Kiessling, entered by Uta Merkel on 30.01.2008

Creative Commons license: CC BY (attribution)