Flag Ponds, Zone 18 (Miocene of the United States)

Where: Calvert County, Maryland (38.5° N, 76.5° W: paleocoordinates 38.6° N, 73.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Drumcliff Member (Choptank Formation), Serravallian (13.8 - 11.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; green, blue, sandy claystone

• bluish green sandy clay

Size class: macrofossils

Primary reference: G. B. Shattuck. 1904. Geological and paleontological relations, with a review of earlier investigations. Maryland Geological Survey Miocene Text xxxiii-clv [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 70845: authorized by Mark Uhen, entered by Mark Uhen on 09.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Cardiida - Veneridae
Mercenaria cuneata Conrad 1869 quahog
Dosinia acetabulum Conrad 1832 venus clam
subspecies blackwelderi
 Lucinida - Lucinidae
Lucinoma contracta Say 1824 clam
 Carditida - Crassatellidae
 Carditida - Astartidae
Astarte thisphila Glenn 1904 clam
 Pectinida - Pectinoidae
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens Ward and Blackwlder 1975 scallop