M 121 (Paleocene of the United States)

Where: Prince Georges County, Maryland (38.7° N, 77.0° W: paleocoordinates 39.2° N, 58.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Aquia Formation (Pamunkey Group), Thanetian (59.2 - 56.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: mesofossils

Primary reference: K. V. Palmer and D. C. Brann. 1965. Catalogue of the Paleocene and Eocene mollusca of the southern and eastern United States. Part 1. Pelecypoda, Amphineura, Peteropoda, Scaphopoda and Cephalopoda. Bulletins of American Paleontology 48:1-471 [M. Kosnik/M. Kosnik/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 99282: authorized by Jocelyn Sessa, entered by Ursula Smith on 04.11.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

 Carditida - Carditidae
 Hiatellida - Hiatellidae
 Pholadomyida - Pholadomyidae
Pholadomya marylandica Conrad 1842 clam
 Stromboidea - Aporrhaidae
 Sorbeoconcha - Turritellidae
"Turritella mortoni" = Kapalmerella mortoni, Turritella humerosa
"Turritella mortoni" = Kapalmerella mortoni Conrad 1830 turret shell
Turritella humerosa Conrad 1835 turret shell
 Trochoidea - Trochidae
"? Monodonta glandula" = Gibbula glandula
"? Monodonta glandula" = Gibbula glandula Conrad 1866 top snail