USGS Loc. 7356 - N of Hudson [Suwannee Lmst] (Oligocene of the United States)

Also known as Mansfield Loc. 30

Where: Pasco County, Florida (28.4° N, 82.7° W: paleocoordinates 28.4° N, 76.4° 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%

Reposited in the USGS

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 60656: authorized by Arnold Miller, entered by Chad Ferguson on 19.05.2006, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

• Occurrence based data only
Show authors, comments, and common names
Gastropoda
 Cerithioidea - Turritellidae
Turritella bowenae
Turritella bowenae Mansfield 1937 turret shell
 Neogastropoda - Volutidae
Lyria musicina
Lyria musicina volute
subspecies - dalli
 Sorbeoconcha - Thersiteidae
Orthaulax hernandoensis
Orthaulax hernandoensis Mansfield 1937 snail
subspecies - hernandoensis
Bivalvia
 Cardiida - Cardiidae
Cardium aff. gadsdenense, "Cardium phlyctaena" = Trachycardium (Dallocardia) phlyctaena
Cardium aff. gadsdenense Mansfield 1937 cockle
"Cardium phlyctaena" = Trachycardium (Dallocardia) phlyctaena Dall 1900 cockle