Where: New Castle County, Delaware (39.6° N, 75.6° W: paleocoordinates 39.0° N, 45.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Mount Laurel Sand Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• Although the matrix of the Didymoceras specimen is similar to the Marshalltown Formation, Kennedy & Cobban placed specimens collected later in the Mount Laurel Sand.

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified claystone and lithified sandstone

Size class: macrofossils

Collected by H. Curlett, W. Beck, R. Heinz

• Repository: Monmouth Amateur Paleontologists Society

Primary reference: W. A. Cobban. 1970. Occurrence of the Late Cretaceous ammonites Didymoceras stevensoni (Whitfield) and Exiteloceras jenneyi (Whitfield) in Delaware. United States Geological Survey Professional Paper 700-D:D71-D76 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 183120: authorized by Matthew Clapham, entered by Matthew Clapham on 03.12.2016

Creative Commons license: CC BY (attribution)