Molluscan Zone 5, Rushmere Mbr, Yorktown Fm - Murfreesboro (Pliocene of the United States)

Where: Herford County, North Carolina (36.4° N, 77.1° W: paleocoordinates 36.5° N, 76.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Rushmere Member (Yorktown Formation), Late/Upper Pliocene (3.6 - 2.6 Ma)

• Unit C in Ward 1992 (Fig. 10), ~1.0 m of sand. Collection from Rushmere Mbr of Yorktown Fm, above the Sunken Meadow Mbr of the Yorktown Fm and underlies a covered interval. Local section name: Murfreesboro. Basinal/regional section name: Hertford County.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, fine-grained, glauconitic, shelly/skeletal, sandy 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; weathered, fine, very sandy, slightly glauconitic; aragonitic shells partially decomposed.

Size class: macrofossils

Preservation: cast, mold/impression

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 59301: 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.
 Pectinida - Pectinoidae
Chesapecten madisonius Say 1824 scallop
 Ostreida - Ostreidae
Conradostrea sculpturata Conrad 1840 oyster
Ostrea compressirostra Say 1824 oyster
Subspecies: O. compressirostra raveneli
 Arcida - Glycymerididae
 Cardiida - Chamidae
Chama congregata Conrad 1833 jewel box
 Cardiida - Veneridae
"Mercenaria rileyi" = Mercenaria campechiensis rileyi
"Mercenaria rileyi" = Mercenaria campechiensis rileyi Conrad 1838 quahog
 Hiatellida - Hiatellidae
 Carditida - Crassatellidae
 Carditida - Astartidae
"Astarte undulata" = Astarte (Ashtarotha) undulata
"Astarte undulata" = Astarte (Ashtarotha) undulata Say 1824 clam