Molluscan Zone 7, Cobham Bay Mbr, Eastover Fm - Murfreesboro (Miocene of the United States)

Where: Herford County, North Carolina (36.4° N, 77.1° W: paleocoordinates 36.6° N, 75.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Cobham Bay Member (Eastover Formation), Late/Upper Miocene (11.6 - 5.3 Ma)

• Unit A in Ward 1992 (Fig. 10), ~1.0 m of sand. Collection from Cobham Bay Mbr of Eastover Fm, at the base of the section and underlies the Sunken Meadow Mbr of the Yorktown Fm. Local section name: Murfreesboro. Basinal/regional section name: Hertford County

• bed-level stratigraphic resolution

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

• Accumulated during transgression; product of only brief period of sedimentation or of erosion; basin conditions interpreted as being open marine, shallow shelf with normal salinities.
• Sand; fine, silty, gray-green, very shelly

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 59299: 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 middlesexensis Mansfield 1936 scallop
Subspecies: C. middlesexensis middlesexensis
Placopecten princepoides Emmons 1858 scallop
 Ostreida - Ostreidae
Ostrea compressirostra Say 1824 oyster
Subspecies: O. compressirostra geraldjohnsoni
 Ostreida - Malleidae
 Carditida - Astartidae
Astarte rappahannockensis Gardner 1943 clam
 Cardiida - Veneridae
Mercenaria druidi Ward 1992 quahog