Molluscan Zone 10 (Unit A), Little Cove Point Mbr, St. Marys Fm - Langleys Bluff (Miocene of the United States)

Where: St Marys County, Maryland (38.3° N, 76.4° W: paleocoordinates 38.4° N, 74.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Little Cove Point Member (St Marys Formation), Late/Upper Miocene (11.6 - 5.3 Ma)

• Unit A in Ward 1992 (Fig. 26), ~0.5 m of sand. Collection from Little Cove Point of St Marys Fm, at the base of the section, and underlies unit B of the Little Cove Point Mbr, St Marys Fm.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, fine-grained, shelly/skeletal, gray, green, silty sandstone

• Accumulated during a transgression. From open shelf marine conditions.
• Sand, silty, fine, olive-gray; excellantly preserved mollusks common.

Size class: macrofossils

Reposited in the USNM

• Most material appears to be reposited in USNM and USGS collections

Primary reference: L. W. Ward. 1992. Molluscan biostratigraphy of the Miocene Middle Atlantic Coastal Plain of North America. Virginia Museum of Natural History 2 [A. Miller/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 59305: authorized by Austin Hendy, entered by Austin Hendy on 25.03.2006, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

• Probably not exhaustive, but a summary of the common and abundant forms from unit. Modern nomenclature utilized with species level assignments.
unclassified
  -
Bivalvia
 Arcida - Arcidae
Dallarca idonea Conrad 1832 clam
 Pectinida - Pectinoidae
Chesapecten covepointensis Ward 1992 scallop
 Carditida - Crassatellidae
Marvacrassatella sp. Ward and Blackwelder 1987 clam
 Lucinida - Lucinidae
Stewartia anodonta Say 1824 clam
Lucinoma contracta Say 1824 clam
 Cardiida - Cardiidae
Chesacardium laqueatum Conrad 1830 cockle
Subspecies: C. laqueatum eschelmani
 Cardiida - Veneridae
Dosinia acetabulum Conrad 1832 venus clam
Subspecies: D. acetabulum throi
Mercenaria cuneata Conrad 1869 quahog
"Clementia inoceriformis" = Clementia (Clementia) inoceriformis Wagner 1839 venus clam
 Cardiida - Mactridae
Mactrodesma subponderosa d'Orbigny 1852 clam
 Hiatellida - Hiatellidae
Panopea goldfussii Wagner 1839 clam
Gastropoda
 Cerithioidea - Turritellidae
"Turritella plebeia" = Mariacolpus plebeia
"Turritella plebeia" = Mariacolpus plebeia Say 1824 turret shell
Subspecies: T. plebeia plebeia
 Neogastropoda - Nassariidae
 Neogastropoda - Terebridae
"Terebra simplex" = Laevihastula simplex
"Terebra simplex" = Laevihastula simplex Conrad 1830 auger snail
Foraminifera
 Rotalioidea - Elphidiidae
Elphidium latispatium Poag 1966
subspecies pontium
Tubothalamea
 Miliolida - Hauerinidae