OR-1, Santee Portland Quarry (Eocene of the United States)

Where: South Carolina (33.5° N, 80.5° W: paleocoordinates 33.5° N, 72.5° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Pregnall Member (Tupelo Bay Formation), Priabonian (38.0 - 33.9 Ma)

• Powell & Baum used Cross at formation rank, but that usage is not followed in later publications. According to Edwards et al. (1997), the Cross Member of the Santee Limestone is dated as both late middle Eocene and late Eocene, representing calcareous nannofossil Zones NP 17 and NP 18. Geisler et al. (2005) re-assessed the stratigraphy and named the Tupelo Bay Formation to include the type Cross Member/Formation and coarser-grained units, which belong to the earliest Priabonian (NP18) Pregnall Member. It is not clear which unit is exposed at the Santee Quarry, but the invertebrate fauna is extremely similar to the Pregnall Member at the Giant Portland Quarry.

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, shelly/skeletal packstone

• Coarse grain size, dominance of packstone and grainstone, and abundance of broken shells suggests shallow subtidal environment
• the upper eocene cross formation is composed of molluscan biomicrudites which grade updip into molluscan biosparrudites.

Size class: macrofossils

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 5363: authorized by Arnold Miller, entered by Karen Layou on 27.09.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Cirostrema cf. nassulum
Cirostrema cf. C. nassulum
 Terebratulida - Cancellothyrididae
Terebratulina spp. d'Orbigny 1847
 Arcida - Glycymerididae
Glycymeris ? staminea Conrad 1833 clam
 Pectinida - Pectinoidae
Chlamys spp. Röding 1798 scallop
Chlamys cookei Kellum 1926 scallop
Placopecten ? spp. Verrill 1897 scallop
 Ostreida - Gryphaeidae
Gigantostrea trigonalis Conrad 1854 oyster
 Ostreida - Ostreidae
Cubitostrea sp. Sacco 1897 oyster
Ostrea sp. Linnaeus 1758 oyster
 Carditida - Crassatellidae
"Crassatella alta" = Crassatellites altus Conrad 1855 clam
Bathytormus cf. flexurus Conrad 1854 clam
Bathytormus cf. B. flexurus
 Carditida - Carditidae
Venericardia spp. Lamarck 1801 clam
 Cardiida - Veneridae
"Callista neusensis" = Meretrix neusensis
"Callista neusensis" = Meretrix neusensis Harris 1919 venus clam
 Cardiida - Tellinidae
Tellina sp. Linnaeus 1758 tellin clam
 Cardiida - Cardiidae
Cardiidae indet. Lamarck 1809 cockle
 Hiatellida - Hiatellidae
Panopea sp. Menard 1807 clam
 Lucinida - Lucinidae
"Lucina cf. pandata" = Eomiltha pandata
"Lucina cf. pandata" = Eomiltha pandata Conrad 1833 clam
Lucina cf. L. padata
 Nuculida - Nuculidae
Nucula sp. Lamarck 1799 nut clam
 Opisthobranchia - Retusidae
Retusa sp. Brown 1827 snail
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
 Cypraeoidea - Cypraeidae
Cypraea sp. Linnaeus 1758 cowry
 Sorbeoconcha - Turritellidae
Turritella spp. Lamarck 1799 turret shell
 Nautilida - Aturiidae
Aturia sp. Bronn 1838 nautiloid
 Nautilida - Nautilidae
Eutrephoceras carolinensis Kellum 1926 nautiloid
 Cidaroida - Cidaridae
Cidaris pratti Clark and Twitchell 1915 pencil urchin
 Clypeasteroida - Protoscutellidae
Periarchus lyelli Conrad 1834 sand dollar
Protoscutella plana Conrad 1865 sand dollar
 Scleractinia - Dendrophylliidae
Endopachys sp. Lonsdale 1845 stony coral
 Scleractinia - Flabellidae
Flabellum sp. Lesson 1831 stony coral