USGS Loc. 10661 - Godwin Bridge [Shoal River Fm] (Miocene of the United States)

Where: Walton County, Florida (30.7° N, 86.1° W: paleocoordinates 31.0° N, 83.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Shoal River Formation (Alum Bluff Group), Serravallian (13.8 - 11.6 Ma)

• STRATIGRAPHIC RELATIONS: From the Shoal River Fm of the Alum Bluff, which lies between the Chipola Fm (Early Miocene) and the Chochtawatchee Fm [Early Pliocene). AGE: Early Miocene (Gardener 1947); Middle Miocene in Vokes (1990) and Portell et al. (2006), although Jones et al. (1993) reports 87Sr/86Sr ratios that yielded average age estimates of 12.4 Ma [=Serravalian]. STRATIGRAPHIC POSITION: From unknown position within formation.

• bed-level stratigraphic resolution

Environment/lithology: marine; unlithified, calcareous marl and unlithified, calcareous sandstone

• marls, sands, clays, for the most part unconsolidated, in places highly calcareous

Size class: macrofossils

Reposited in the USGS

Primary reference: J. R. Gardner. 1947. The Molluscan Fauna of the Alum Bluff Group of Florida. United States Geological Survey Professional Paper (142A-H)1-709 [A. Miller/K. Layou/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42888: authorized by Arnold Miller, entered by Karen Layou on 06.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Sorbeoconcha - Naticidae
"Polinices (Neverita) eucallosus" = Neverita, "Polinices (Neverita) chipolanus" = Neverita chipolanus, "Natica (Tectonatica) semen" = Tectonatica
"Polinices (Neverita) eucallosus" = Neverita moon snail
present
"Polinices (Neverita) chipolanus" = Neverita chipolanus Dall 1892 moon snail
rare
"Natica (Tectonatica) semen" = Tectonatica moon snail
present
 Sorbeoconcha - Caecidae
Bivalvia
 Arcida - Arcidae
"Arca (Diluvarca) waltonia" = Anadara (Diluvarca)
"Arca (Diluvarca) waltonia" = Anadara (Diluvarca) ark
common
 Lucinida - Lucinidae
"Phacoides (Parvilucina) vaughani" = Parvilucina
"Phacoides (Parvilucina) vaughani" = Parvilucina clam
common
 Pholadida - Corbulidae
"Corbula (Caryocorbula) whitfieldi" = Cuneocorbula whitfieldi, Corbula (Caryocorbula) seminella, "Corbula waltonensis" = Varicorbula disparilis
"Corbula (Caryocorbula) whitfieldi" = Cuneocorbula whitfieldi Brown 1905 clam
present
"Corbula waltonensis" = Varicorbula disparilis d'Orbigny 1853 clam
present
 Cardiida - Lasaeidae
Aligena lineata aligena
rare
 Cardiida - Mactridae
"Spisula (Hemimactra) craspedota" = Spisula craspedota
"Spisula (Hemimactra) craspedota" = Spisula craspedota Gardner 1947 clam
common
 Cardiida - Tellinidae
Tellina (Moerella) piesa Gardner 1947 tellin clam
present
 Cardiida - Semelidae
Ervilia valhosierr Gardner 1928 clam
present
 Carditida - Crassatellidae
"Crassatellites (Crassinella) tanicus" = Crassinella
"Crassatellites (Crassinella) tanicus" = Crassinella clam
rare
 Nuculida - Nuculidae
Nucula chipolana nut clam
present