Lloyd [Tampa Limestone] (Oligocene to of the United States)

Also known as Mansfield station #11

Where: Jefferson County, Florida (30.5° N, 84.0° W: paleocoordinates 30.8° N, 79.3° W)

• coordinate based on nearby landmark

• outcrop-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 61096: authorized by Arnold Miller, entered by Chad Ferguson on 29.05.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Occurrence based data only
Gastropoda
 Cycloneritida - Helicinidae
 Cerithioidea - Turritellidae
 Cerithioidea - Potamididae
 Cerithioidea - Batillariidae
 Sorbeoconcha - Strombidae
 Neogastropoda - Olividae
"Olivella ? eutorta" = Omogymna eutorta
"Olivella ? eutorta" = Omogymna eutorta Dall 1915 olive snail
 Neogastropoda - Fasciolariidae
 Neogastropoda - Conidae
Conus planiceps Heilprin 1887 cone shell
two distinct occurrences: species planiceps and subspecies wakullensis
 Neogastropoda - Costellariidae
 Neogastropoda - Volutidae
 Sorbeoconcha - Cypraeidae
"Cypraea tumulus" = Zonaria tumulus
"Cypraea tumulus" = Zonaria tumulus Heilprin 1886 cowry
 Stylommatophora - Bulimulidae
"Bulimulus (Hyperaulax) ? americanus" = Tocobaga americanus
"Bulimulus (Hyperaulax) ? americanus" = Tocobaga americanus Heilprin 1886 slug
 Stylommatophora - Camaenidae
Bivalvia
 Arcida - Arcidae
"Barbatia (Acar) domingensis" = Acar domingensis
"Barbatia (Acar) domingensis" = Acar domingensis Lamarck 1819 miniature ark
 Arcida - Glycymerididae
"Glycymeris ? lamyi" = Tucetona lamyi
"Glycymeris ? lamyi" = Tucetona lamyi Dall 1915 clam
 Pectinida - Pectinoidae
 Ostreida - Ostreidae
Ostrea vaughani Dall 1915 oyster
 Cardiida - Cyrenidae
 Cardiida - Veneridae
Venus ? halidona venus clam
 Cardiida - Cardiidae
"? Hippopus gunteri" = Omanidacna gunteri Mansfield 1937 cockle
 Carditida - Carditidae
"Venericardia serricosta" = Venericardia (Glyptoactis) serricosta
"Venericardia serricosta" = Venericardia (Glyptoactis) serricosta Heilprin 1887 clam
 Carditida - Crassatellidae