Zone 1, Yorktown Fm - Schmidts Bluff (Pliocene of the United States)

Where: Surry County, Virginia (37.2° N, 77.0° W: paleocoordinates 37.3° N, 76.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Zone 1 Member (Yorktown Formation), Pliocene (5.3 - 2.6 Ma)

• Yorktown Formation, zone 1. Contact with underlying bed is evident but not very regular. Unit is 8 ft thick.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, medium-grained, brown, gray sandstone

• Shallow water siliciclastic setting. No specific environmental data provided in text.
• Medium-grained gray to buff sands.

Size class: macrofossils

Collection methods: Material from this locality are reposited in USNM and Wagner Free Inst. Sci.

Primary reference: J. A. Gardner. 1943. Mollusca from the Miocene and Lower Pliocene of Virginia and North Carolina. Part 1. Pelecypoda. United States Geological Survey Professional Paper 199(A):1-178 [A. Miller/A. Hendy/S. Ávila]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 59293: authorized by Austin Hendy, entered by Austin Hendy on 25.03.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Not exhaustive, and slightly antiquated nomenclature, though with species-level designations. Only Bivalvia and Gastropoda listed.
Gastropoda
 Cerithioidea - Turritellidae
"Turritella variabilis" = Turritella (Torcula) variabilis
"Turritella variabilis" = Turritella (Torcula) variabilis Conrad 1830 turret shell
Subspecies: T. variabilis pilsbryi
Bivalvia
 Carditida - Carditidae
"Venericardia granulata" = Cyclocardia granulata
"Venericardia granulata" = Cyclocardia granulata Say 1824 clam
 Carditida - Astartidae
"Astarte undulata" = Astarte (Ashtarotha) undulata Say 1824 clam
Subspecies: A. undulata deltoides and A. undulata varginulata
 Lucinida - Lucinidae
"Phacoides (Pseudomiltha) anodonta" = Stewartia anodonta
"Phacoides (Pseudomiltha) anodonta" = Stewartia anodonta Say 1824 clam
 Pholadida - Teredinidae
 Cardiida - Veneridae
"Venus rileyi" = Mercenaria campechiensis rileyi Conrad 1838 quahog
 Cardiida - Mactridae
Spisula confraga Conrad 1833 clam
 Arcida - Glycymerididae
"Glycymeris subovata" = Costaglycymeris subovata
"Glycymeris subovata" = Costaglycymeris subovata Say 1824 clam
 Ostreida - Malleidae
 Pectinida - Pectinoidae
"Pecten clintonius" = Placopecten clintonius, "Pecten eboreus" = Carolinapecten eboreus, "Pecten jeffersonius" = Chesapecten jeffersonius
"Pecten clintonius" = Placopecten clintonius Say 1824 scallop
"Pecten eboreus" = Carolinapecten eboreus Conrad 1833 scallop
Subspecies: Pecten eboreus watsonensis
"Pecten jeffersonius" = Chesapecten jeffersonius Say 1824 scallop
Crassatellites undulatus
  -
"Crassatellites undulatus" = Kalolophus antillarum
"Crassatellites undulatus" = Kalolophus antillarum Reeve 1842
Subspecies: C. undulatus cyclopterus