Molluscan Zone 6, Sunken Meadow Mbr, Yorktown Fm - Sunken Meadow Creek (Pliocene of the United States)

Where: Surry County, Virginia (37.2° N, 76.9° W: paleocoordinates 37.3° N, 76.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Sunken Meadow Member (Yorktown Formation), Early/Lower Pliocene (5.3 - 3.6 Ma)

• Unit C in Ward 1992 (Fig. 11), ~2.0 m of sand. Collection from Sunken Meadow Mbr of Yorktown Fm, which overlies a thin unit of Cobham Bay Mbr, Eastover Fm and underlies the Rushmere Mbr of the Yorktown Fm.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, shelly/skeletal sandstone

• No geologic or environmental data provided in text. Presumably accumulated during a successive transgression following post Eastover Fm regression. Appears to contain a normal marine fauna.
• Sand, shelly, fine.

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 59297: authorized by Austin Hendy, entered by Austin Hendy on 25.03.2006

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.
 Cerithioidea - Turritellidae
Turritella pilsbryi Gardner 1928 turret shell
 Neogastropoda - Conidae
Conus marylandicus Green 1830 cone shell
[entered as Conus marylandica]
 Neogastropoda - Muricidae
Ecphora quadricostata Conrad 1830 murex snail
 Pectinida - Pectinoidae
 Ostreida - Ostreidae
Ostrea compressirostra Say 1824 oyster
Subspecies: O. compressirostra compressirostra
 Arcida - Glycymerididae
 Carditida - Carditidae
Cyclocardia granulata Say 1824 clam
 Carditida - Astartidae
 Carditida - Crassatellidae
 Hiatellida - Hiatellidae
 Cardiida - Glossidae
Glossus fraterna Say 1824 clam
 Cardiida - Veneridae
 Pholadida - Teredinidae
Kuphus fistula Lea 1843 clam
 Lucinida - Lucinidae
Stewartia anodonta Say 1824 clam
Lucinoma contracta Say 1824 clam