Where: New Castle County, Delaware (39.5° N, 75.7° W: paleocoordinates 39.0° N, 45.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Marshalltown Formation (Matawan Group), Late/Upper Campanian (83.5 - 70.6 Ma)

• The Marshalltown Formation yields Pachydiscus (Pachydiscus) sp., Menuites portlocki (Sharpe, 1855) complexus (Hall and Meek, 1856), a subspecies restricted to the Baculites gregoryensis and Baculites scotti zones in the Western Interior of the United States, and Didymoceras binodosum (Kennedy and Cobban, 1993a) known only from the B. scotti zone of the Western Interior and correlatives in Arkansas and Texas.

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; sandstone

Size class: macrofossils

Collected by C.W. Carter; 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 78120: authorized by Wolfgang Kiessling, entered by Uta Merkel on 29.01.2008

Creative Commons license: CC BY (attribution)