Where: District of Columbia (38.9° N, 77.0° W: paleocoordinates 33.0° N, 30.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Arundel Clay Formation (Potomac Group), Early/Lower Aptian (125.5 - 122.5 Ma)

• now considered early-mid Aptian

• bed-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; ferruginous claystone and ferruginous conglomerate

Size class: macrofossils

Collected by J. K. Murphy in 1898; reposited in the USNM

Collection methods: bulk, salvage,

Primary reference: R. S. Lull. 1911. Systematic paleontology of the Lower Cretaceous deposits of Maryland: Vertebrata. Maryland Geological Survey: Lower Cretaceous 183-211 [M. Carrano/M. Carrano/M. Carrano] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 52675: authorized by Matt Carrano, entered by Matt Carrano on 16.08.2005