Where: Prince George's County, Maryland (39.0° N, 76.9° W: paleocoordinates 32.9° N, 31.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Arundel Clay Formation (Potomac Group), Late/Upper Aptian (122.5 - 113.0 Ma)

• Palynology of the Potomac Group suggests a late Aptian age for the Arundel facies (Brenner, 1963; Doyle and Robbins, 1977; Hochuli et al., 2006; Doyle, 2012)

• bed-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; ferruginous claystone

Size class: macrofossils

Collected by A. Bibbins in 1896; reposited in the USNM

• Maryland Geological Survey and USNM collections

Primary reference: R. S. Lull. 1911. Systematic paleontology of the Lower Cretaceous deposits of Maryland: Vertebrata. In W. B. Clark, A. B. Bibbins, E. W. Berry, & R. S. Lull (eds.), Lower Cretaceous 183-211 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 79430: authorized by Matthew Carrano, entered by Matthew Carrano on 07.03.2008

Creative Commons license: CC BY (attribution)