AMo-2 Tuscahoma (Paleocene of the United States)

Where: Monroe County, Alabama (31.8° N, 87.4° W: paleocoordinates 34.3° N, 70.2° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Bells Landing Marl Member (Tuscahoma Formation), Thanetian (59.2 - 56.0 Ma)

• The fossiliferous bed, about 9 feet thick, contains the characteristic large spheroidal concretions 5 or 6 feet thick, and the characteristic large shells of Ostrea sinuosa, Venericardia aposmithii, and Turritella postmortoni as well as other mollusks.

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; unlithified, glauconitic, gray, green sandstone

• Sand, gray-green, weathers yellowish-gray, massive, very fined grained, glauconitic, very fossiliferous.

Size class: mesofossils

Primary reference: L. D. Toulmin. 1977. Stratigraphic Distribution of Paleocene and Eocene Fossils in the Eastern Gulf Coast Region. Geological Survey of Alabama, Monograph 13(1):1-602 [M. Patzkowsky/K. Layou/P. Mannion]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 80761: authorized by Arnold Miller, entered by Jocelyn Sessa on 06.05.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Cerithioidea - Turritellidae
Mesalia alabamiensis De Gregorio 1890 turret shell
25 are Mesalia alabamiensis tetradeiras
"Turritella mortoni" = Kapalmerella mortoni Conrad 1830 turret shell
Turritella mortoni postmortoni
Turritella bellifera turret shell
Turritella praecincta turret shell
 Neogastropoda - Clavatulidae
"Surcula nasuta" = Turricula
"Surcula nasuta" = Turricula snail
 Neogastropoda - Buccinidae
Pseudoliva vetusta Conrad 1833 true whelk
Pseudoliva vetusta forma
"Siphonalia" sp. Adams 1863 true whelk
 Neogastropoda - Nassariidae
"Buccinanops ellipticum" = Bullia (Buccinanops)
"Buccinanops ellipticum" = Bullia (Buccinanops) snail
 Neogastropoda - Melongenidae
Levifusus sp. Conrad 1865 snail
"Levifusus trabeatus"
Levifusus pagodiformis Heilprin 1881 snail
 Neogastropoda - Volutidae
Athleta tuomeyi, "cf. Scaphella newcombiana" = Scaphella
"cf. Scaphella newcombiana" = Scaphella volute
 Sorbeoconcha - Rostellariidae
 Sorbeoconcha - Naticidae
Euspira marylandica Conrad 1865 moon snail
Euspira marylandica var.
Sinum fiski moon snail
cf. Natica aperta moon snail
"Natica" sp. Scopoli 1777 moon snail
Bivalvia
 Pectinida - Pectinoidae
"Chlamys greggi" = Dhondtichlamys greggi
"Chlamys greggi" = Dhondtichlamys greggi Harris 1897 scallop
 Ostreida - Ostreidae
 Hiatellida - Hiatellidae
 Pholadida - Corbulidae
"Corbula subengonata" = Cuneocorbula subengonata
"Corbula subengonata" = Cuneocorbula subengonata Dall 1898 clam
 Cardiida - Veneridae
Pitar nuttalliopsis venus clam
Pitar nuttalliopsis greggi
Dosiniopsis lenticularis Rogers 1838 venus clam
 Carditida - Carditidae
? Venericardia nanaplata Gardner and Bowles 1939 clam
? Venericardia nanaplata nanna
 Carditida - Crassatellidae
Crassatella tumidula Whitfield 1865 clam
 Nuculanida - Nuculanidae
"Calorhadia pharcida" = Calorhadia (Calorhadia) pharcida
"Calorhadia pharcida" = Calorhadia (Calorhadia) pharcida Dall 1898 pointed nut clam