Flag Ponds, Zone 19 (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: Boston Cliffs Member (Choptank Formation), Serravallian (13.8 - 11.6 Ma)

• Formerly Calvert Formation

• bed-level stratigraphic resolution

Environment/lithology: marine; sandy claystone

• 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 70846: authorized by Mark Uhen, entered by Mark Uhen on 09.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gastropoda
 Cerithioidea - Turritellidae
"Turritella plebeia" = Mariacolpus plebeia, Turritella terebriformis
"Turritella plebeia" = Mariacolpus plebeia Say 1824 turret shell
subspecies plebeia
Turritella terebriformis Conrad 1863 turret shell
 Neogastropoda - Muricidae
Ecphora meganae
Ecphora meganae Ward and Gilinsky 1988 murex snail
subspecies williamsi
Bivalvia
 Pectinida - Pectinoidae
Chesapecten monicae, "Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens, "Pecten madisonius" = Chesapecten madisonius
Chesapecten monicae Ward 1992 scallop
"Chesapecten nefrens" = Chesapecten (Chesapecten) nefrens Ward and Blackwlder 1975 scallop
"Pecten madisonius" = Chesapecten madisonius Say 1824 scallop
 Ostreida - Malleidae
Isognomon (Hippochaeta) sp.
 Ostreida - Ostreidae
Ostrea carolinensis
Ostrea carolinensis Conrad 1832 oyster
 Arcida - Arcidae
Dallarca elevata, "Arca staminea" = Dallarca staminea
"Arca staminea" = Dallarca staminea Say 1832 clam
 Cardiida - Cardiidae
"Cardium laqueatum" = Chesacardium laqueatum, "Chesacardium laqueatum" = Chesacardium laqueatum
"Cardium laqueatum" = Chesacardium laqueatum Conrad 1830 cockle
"Chesacardium laqueatum" = Chesacardium laqueatum Conrad 1830 cockle
subspecies vostreysi
 Cardiida - Tellinidae
Florimetis biplicata
Florimetis biplicata Conrad 1834 tellin clam
 Cardiida - Glossidae
Glossus marylandica
Glossus marylandica Schoonover 1941 clam
 Cardiida - Veneridae
Dosinia acetabulum, Mercenaria cuneata, "Clementia inoceriformis" = Clementia (Clementia) inoceriformis, "Pleiorytis calvertensis" = Petricola (Petricolaria) calvertensis, Macrocallista marylandica
Dosinia acetabulum Conrad 1832 venus clam
subspecies blackwelderi
Mercenaria cuneata Conrad 1869 quahog
"Clementia inoceriformis" = Clementia (Clementia) inoceriformis Wagner 1839 venus clam
"Pleiorytis calvertensis" = Petricola (Petricolaria) calvertensis Dall 1900 venus clam
Macrocallista marylandica Conrad 1833 venus clam
 Pholadida - Corbulidae
"Corbula idonea" = Bicorbula idonea, "Bicorbula idonea" = Bicorbula idonea
"Corbula idonea" = Bicorbula idonea Conrad 1833 clam
"Bicorbula idonea" = Bicorbula idonea Conrad 1833 clam
 Hiatellida - Hiatellidae
Panopea americana
Panopea americana Conrad 1838 clam
 Lucinida - Lucinidae
Lucinoma contracta, Stewartia anodonta, Phacoides anodonata
Lucinoma contracta Say 1824 clam
Stewartia anodonta Say 1824 clam
 Carditida - Crassatellidae
"Crassatellites marylandica" = Crassatella, Marvacrassatella marylandica
"Crassatellites marylandica" = Crassatella clam
 Carditida - Astartidae
Astarte obruta, Astarte thisphila
Astarte obruta Conrad 1834 clam
Astarte thisphila Glenn 1904 clam
Thecostraca
 Balanomorpha - Balanidae
"Balanus concavus" = Concavus concavus
"Balanus concavus" = Concavus concavus Bronn 1831 barnacle