Flag Ponds, Zone 17 (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)

• Formerly Calvert Formation

• bed-level stratigraphic resolution

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

• Mollusk-dense pale yellow-brown to pale orange well-sorted sand; sub-tropical to temperate, in a current-swept channel-like basin
• 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 70844: authorized by Mark Uhen, entered by Mark Uhen on 09.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Cerithioidea - Turritellidae
"Turritella plebeia" = Mariacolpus plebeia
"Turritella plebeia" = Mariacolpus plebeia Say 1824 turret shell
subspecies plebeia
 Neogastropoda - Muricidae
Ecphora meganae Ward and Gilinsky 1988 murex snail
subspecies meganae
Bivalvia
 Arcida - Arcidae
Dallarca elnia Glenn 1904 clam
 Pectinida - Pectinoidae
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens Ward and Blackwlder 1975 scallop
 Ostreida - Malleidae
 Lucinida - Lucinidae
Lucinoma contracta Say 1824 clam
 Pholadida - Corbulidae
Bicorbula idonea Conrad 1833 clam
 Cardiida - Glossidae
Glossus marylandica Schoonover 1941 clam
 Cardiida - Veneridae
"Pleiorytis calvertensis" = Petricola (Petricolaria) calvertensis Dall 1900 venus clam
Dosinia acetabulum Conrad 1832 venus clam
subspecies blackwelderi
Mercenaria cuneata Conrad 1869 quahog
 Cardiida - Ungulinidae
Timothynus subvexa Conrad 1833 clam
 Cardiida - Cardiidae
Chesacardium laqueatum Conrad 1830 cockle
subspecies blackwelderi
 Cardiida - Tellinidae
Florimetis biplicata Conrad 1834 tellin clam
 Hiatellida - Hiatellidae
Panopea americana Conrad 1838 clam
Panopea goldfussii Wagner 1839 clam
 Carditida - Astartidae
Astarte thisphila Glenn 1904 clam
 Carditida - Crassatellidae
Mammalia
 Placentalia -
Cetacea indet. Brisson 1762 whale