OR-2 (Cross Fm., South Carolina) (Eocene of the United States)

Where: Orangeburg County, South Carolina (33.4° N, 80.8° W: paleocoordinates 33.4° N, 72.8° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Crassatella alta/Chlamys cawcawensis zone, Cross Formation, Late/Upper Eocene (37.2 - 33.9 Ma)

• According to Powell and Baum, this collection also falls under the Periarchus lyelli faunal zone.

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified, shelly/skeletal wackestone and grainstone

• "[The Cross Formation's] fauna is somewhat depauperate and in association suggests a termperate climate."
• the upper eocene cross formation is composed of molluscan biomicrudites which grade updip into molluscan biosparrudites.

Primary reference: R. J. Powell and G. R. Baum. 1982. Eocene biostratigraphy of South Carolina and its relationship to Gulf Coastal Plain zonations and global changes of coastal onlap. Geological Society of America Bulletin 93:1099-1108 [A. Miller/K. Layou]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5364: authorized by Arnold Miller, entered by Karen Layou on 27.09.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Lepetellida - Fissurellidae
Puncturella sp. Lowe 1827 puncturella
 Neotaenioglossa - Calyptraeidae
Calyptraea sp. Lamarck 1799 slipper shell
Bivalvia
 Arcida - Glycymerididae
Glycymeris sp. Da Costa 1778 clam
 Pectinida - Pectinoidae
Chlamys spp. Röding 1798 scallop
Chlamys cf. cocoana scallop
Chlamys cf. C. cocoana
Chlamys deshayesii Lea 1833 scallop
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Mytilida - Mytilidae
Modiolus sp. Lamarck 1801 mussel
 Cardiida - Veneridae
"Callista neusensis" = Meretrix neusensis
"Callista neusensis" = Meretrix neusensis Harris 1919 venus clam
 Cardiida - Cardiidae
Cardiidae indet. Lamarck 1809 cockle
 Carditida - Crassatellidae
"Crassatella alta" = Crassatella uvasana
"Crassatella alta" = Crassatella uvasana Conrad 1855 clam
 Nuculida - Nuculidae
Nucula sp. Lamarck 1799 nut clam
Rhynchonellata
 Terebratulida - Cancellothyrididae
Terebratulina spp. d'Orbigny 1847
Echinoidea
 Cidaroida - Cidaridae
Cidaris pratti Clark and Twitchell 1915 pencil urchin