Also known as Arkadelphia; USGS # 18880

Where: Clark County, Arkansas (34.1° N, 93.1° W: paleocoordinates 38.7° N, 70.1° W)

• outcrop-level geographic resolution

When: Arkadelphia marl Formation, Maastrichtian (72.1 - 66.0 Ma)

• Haustator bilira assemblage zone.

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified, gray, sandy siltstone

Preservation: original aragonite, original calcite

Reposited in the USGS

• others collection

Primary reference: N. F. Sohl and C. F. Koch. 1984. Upper Cretaceous (Maestrichtian) larger invertebrate Fossils from the Haustator bilira Assemblage Zone in the west gulf Coastal Plain. USGS Open File Report 84-687:1-282 [M. Kosnik/M. Kosnik]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 4387: authorized by Matt Kosnik, entered by Matt Kosnik on 14.08.1999

Creative Commons license: CC BY (attribution)