Above and below Willis bridge [Tampa Limestone] (Oligocene to of the United States)

Also known as Mansfield Loc.'s 24, 25, and 26.

Where: Calhoun County, Florida (30.5° N, 85.2° W: paleocoordinates 30.8° N, 80.3° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Tampa Limestone Member (Arcadia Formation), Chattian to Chattian (28.1 - 20.4 Ma)

• LITHOSTRATIGRAPHY: Formerly referred to as the Tampa Limestone. Scott et al. (2001) assign the Tampa to the rank of member and place it in the Arcadia Formation. AGE: Mansfield suggests age equivalencies (based primarily on faunal similarities) with the Chipola Fm., the Trent Marl of North Carolina, and the Anguilla Fm. of Anguilla. Placed here into the Chattian-Aquitanian on the basis of most recent chronostratigraphy.

• member-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, white, sandy, cherty/siliceous limestone

• Sand size quartz grains and an abundance of freshwater molluscs in the Tampa Limestone indicate nearshore deposition.
• The Tampa LS member of the Arcadia Fm. is more quartz sand rich and poorer in calcium carbonate than the underlying Suwannee LS. Fossils are often preserved via silicification and can be found in fully replaced, partially replaced or unaltered states. From several localities, a buff to dirty limestone matrix is reported, speckled with quartz sand grains of medium size.

Size class: mesofossils

Preservation: cast, mold/impression, permineralized, replaced with silica

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 61128: authorized by Arnold Miller, entered by Chad Ferguson on 29.05.2006, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

• Occurrence based data only
Bivalvia
 Arcida - Glycymerididae
"Glycymeris lamyi" = Tucetona lamyi
"Glycymeris lamyi" = Tucetona lamyi Dall 1915 clam
 Pectinida - Pectinoidae
"Chlamys (Lyropecten) ? burnetti" = Lyropecten
"Chlamys (Lyropecten) ? burnetti" = Lyropecten scallop
 Carditida - Carditidae
"Venericardia serricosta" = Venericardia (Glyptoactis) serricosta
"Venericardia serricosta" = Venericardia (Glyptoactis) serricosta Heilprin 1887 clam
 Cardiida - Veneridae
Anomalocardia penita, "Antigona (Artena) glyptoconcha" = Artena, "Antigona (Artena) shepardi" = Artena
"Antigona (Artena) glyptoconcha" = Artena venus clam
"Antigona (Artena) shepardi" = Artena venus clam
Gastropoda
 Neogastropoda - Harpidae
"Morum chipolanum" = Morum (Oniscidia) chipolanum
"Morum chipolanum" = Morum (Oniscidia) chipolanum Dall 1925 snail
subspecies: tampanum
 Calyptraeoidea - Calyptraeidae
Calyptraea (Trochita) aperta Solander 1766 slipper shell
 Sorbeoconcha - Cerithiidae
Cerithium sp. Bruguière 1789 cerith snail
 Pulmonata - Camaenidae