River Junction, highest bed [Tampa Limestone] (Oligocene to of the United States)

Where: Gadsden County, Florida (30.7° N, 84.8° W: paleocoordinates 31.0° N, 79.9° 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.

• bed-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: macrofossils

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 61110: 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
 Arcida - Arcidae
"Arca (Arca) ? umbonata" = Arca (Arca) imbricata Bruguière 1789 ark
 Arcida - Glycymerididae
 Pectinida - Pectinoidae
Chlamys sp. Röding 1798 scallop
species A
 Mytilida - Mytilidae
"Modiolus (Botula) cinnamomeus" = Botula cinnamomeus, Lithophaga antillarum
"Modiolus (Botula) cinnamomeus" = Botula cinnamomeus Lamarck 1819 mussel
 Carditida - Carditidae
"Venericardia serricosta" = Venericardia (Glyptoactis) serricosta
"Venericardia serricosta" = Venericardia (Glyptoactis) serricosta Heilprin 1887 clam
 Cardiida - Ungulinidae
 Cardiida - Veneridae
Anomalocardia penita, "Antigona (Artena) shepardi" = Artena
"Antigona (Artena) shepardi" = Artena venus clam
 Cardiida - Semelidae
 Cardiida - Cardiidae
"Cardium (Trachycardium) brooksvillense" = Trachycardium, "Cardium (Trigoniocardia) gadsdenense" = Trigoniocardia, "? Hippopus ? gunteri" = Omanidacna gunteri
"Cardium (Trachycardium) brooksvillense" = Trachycardium cockle
subspecies: conjunctionense
"Cardium (Trigoniocardia) gadsdenense" = Trigoniocardia cockle
"? Hippopus ? gunteri" = Omanidacna gunteri Mansfield 1937 cockle
 Lucinida - Lucinidae
Lucina sp., Phacoides (Linga) wacissanus, "Phacoides (Lucinisca) silicatus" = Lucinisca
Lucina sp. Bruguière 1797 clam
could be more than one species
"Phacoides (Lucinisca) silicatus" = Lucinisca clam
 Nuculida - Nuculidae
 Cephalaspidea - Cylichnidae
 Architaenioglossa - Ampullinidae
 Neogastropoda - Muricidae
 Neogastropoda - Conidae
Conus ? iliolus cone shell
Conus planiceps Heilprin 1887 cone shell
 Stromboidea - Thersiteidae
Orthaulax ? pugnax Heilprin 1887 snail
 Cypraeoidea - Cypraeidae
"Cypraea tumulus" = Zonaria tumulus
"Cypraea tumulus" = Zonaria tumulus Heilprin 1886 cowry
 Calyptraeoidea - Calyptraeidae
Calyptraea (Trochita) aperta Solander 1766 slipper shell
 Sorbeoconcha - Siliquariidae
"Siliquaria ? tampensis" = Tenagodus
"Siliquaria ? tampensis" = Tenagodus snail
 Sorbeoconcha - Turritellidae