USGS Loc. 6828, 12746 - Falmouth [Suwannee Lmst] (Oligocene of the United States)

Where: Suwanee County, Florida (30.4° N, 83.1° W: paleocoordinates 30.4° N, 76.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Suwannee Limestone Formation (Vicksburg Group), Rupelian (33.9 - 28.1 Ma)

• Cunningham et al. (1998) identified Suwannee LS as Early Oligocene age. Cooke and Mansfield (1936) assigned Suwannee to Vicksburg group. Suwannee assigned to Rupelian Stage (early Oligocene) by Brewster-Wingard et al. (1987) and COSUNA (1988).

• formation-level stratigraphic resolution

Environment/lithology: lithified, white limestone

• Author notes that the fauna indicate warm water conditions rather than cold.
• The formation consists almost entirely of limestone. The unweathered rock is a granular to dense, compact, usually cream-colored rather pure limestone. The lower par is at many places more granular than the upper. Mossom (1925) provided the following lithologic description from the Suwannee LS quarry of the Florida Hard Rock Products Co., Brooksville, FL: Silica - 6.54%; Iron and aluminum - 1.44%; Calcium carbonate - 91.09%; Magnesium carbonate - trace; Undetermined - 0.93%

Primary reference: W. C. Mansfield. 1937. Molluscs of the Tampa and Suwannee Limestones. Geological Bulletin, State of Florida Department of Conservation 15:1-334 [A. Miller/C. Ferguson/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 60960: authorized by Arnold Miller, entered by Chad Ferguson on 28.05.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Occurrence based data only
Show authors, comments, and common names
Echinoidea
 Cassiduloida - Cassidulidae
Rhyncholampas gouldii
Rhyncholampas gouldii Bouvé 1846 sea urchin
Gastropoda
 Cerithioidea - Cerithiidae
"Cerithium ? vaginatum" = Cestumcerithium vaginatum
"Cerithium ? vaginatum" = Cestumcerithium vaginatum Mansfield 1937 cerith snail
 Neogastropoda - Fasciolariidae
? Latirus sp.
? Latirus sp. Monfort 1810 snail
Bivalvia
 Arcida - Glycymerididae
Glycymeris ? hillsboroughensis
 Cardiida - Veneridae
"Chione aff. bainbridgensis" = Chione (Chionopsis) bainbridgensis
"Chione aff. bainbridgensis" = Chione (Chionopsis) bainbridgensis Dall 1916 venus clam
 Lucinida - Lucinidae
Phacoides ? hernandoensis, Phacoides ? wacissanus
Phacoides ? hernandoensis Mansfield 1937 clam
Phacoides ? wacissanus Dall 1915 clam