USGS 3383 - Little Horseshoe Bend (Flint River Fm) (Oligocene of the United States)

Also known as Station 3383

Where: Decatur County, Georgia (30.9° N, 84.6° W: paleocoordinates 31.0° N, 78.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Flint River Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• From upper bed. Assigned to Lower Oligocene (Rupelian) by Scott et al. 2001 following mapping by Cooke (1945).

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified reef rocks

• Shallow-water carbonate environment.
• Limestone, also referred to as fossil coral reef.

Size class: macrofossils

Preservation: cast, mold/impression, replaced with silica

Reposited in the USNM

• Collected by T.W. Vaughan (1900). Reposted in USNM collections.

Primary reference: W. H. Dall. 1916. A contribution to the invertebrate fauna of the Oligocene beds of Flint, River. Proceedings of the United States National Museum 51(2162):487-524 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 60825: authorized by Austin Hendy, entered by Austin Hendy on 24.05.2006, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for mollusca; from fairly poorly preserved assemblage; many identifications and types based on casts and molds.
Bivalvia
 Arcida - Arcidae
 Arcida - Glycymerididae
Gastropoda
 Architaenioglossa - Ampullinidae
 Neogastropoda - Mitridae
Mitra syra Dall 1915 mitre shell
 Tonnoidea - Cassidae
 Sorbeoconcha - Turritellidae
Turritella tampae Heilprin 1887 turret shell
 Trochoidea - Liotiidae
Echinoidea
 Clypeasteroida - Fibulariidae
Echinocyamus vaughani Clark and Twitchell 1915 sand dollar