PBDB Collection

Pea River at Elba Dam (ACof-1) (Eocene of the United States)

Where: Coffee County, Alabama (31.4° N, 86.1° W: paleocoordinates 33.1° N, 71.7° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Bashi Marl Member (Hatchetigbee Formation), Ypresian (56.0 - 47.8 Ma)

• The Bashi Marl Member of the Hatchetigbee Formation is retained in the Eocene M. subbotinae Interval Zone. The Paleocene-Eocene boundary is near the base of the Bashi Marl Member of the Hatchetigbee Form

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; unlithified, fine-grained, medium, glauconitic, gray, green, calcareous sandstone

• A transgressive lag composed of glauconitic and calcareous marl and sand, representing an inner shelf environment (Dockery, 1980, 1998; Gibson, 1982; Mancini, 1984; Siesser, 1983; Ingram, 1991; Mancini and Tew, 1991, 1995; Sessa et al., 2012b). Elba Dam is the deepest site for the Bashi Marl; using foraminiferal assemblages, Gibson (1988) estimated the Bashi Marl to be ~70 m deep at Elba, AL. This water depth estimate, contrasted with more clear shoreface deposits in the shallowest part of the formation (eastern Mississippi) suggests that an offshore transition environment is appropriate here.

• Fossiliferous glauconitic sand bed, in which large spheroidal concretions have formed, contains foraminifera and a great variety of well-preserved mollusks. Sand, dark-greenish-gray (5GY 4/1) when wet to greenish-gray (5GY 6/1) and light-olive-gray (5Y 6/1), fine- to medium-grained, very glauconitic, very calcareous.

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 80785: authorized by Arnold Miller, entered by Jocelyn Sessa on 08.05.2008, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

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Echinoidea
Cassiduloida - Neolampadidae	Eurhodia elbana n. sp. Eurhodia elbana n. sp. Cooke 1942 sea urchin
Chondrichthyes
Euselachii -	Batoidea indet. Batoidea indet. ray tooth
Cephalopoda
Nautilida - Hercoglossidae	Aturoidea sp. Aturoidea sp. Vredenburg 1925 nautiloid
Scaphopoda
Dentaliida - Dentaliidae	Dentalium microstria Dentalium microstria Heilprin 1880 tusk shell
Gastropoda
Heterostropha - Mathildidae	Gegania sp. Gegania sp. Jeffreys 1884 snail
Heterostropha - Acteonidae	Tornatellaea bella Tornatellaea bella Conrad 1860 snail
Trochoidea - Solariellidae	Solariella sylvaerupis Solariella sylvaerupis snail
Cerithioidea - Turritellidae	Turritella gilberti Turritella gilberti turret shell
Sorbeoconcha - Naticidae	Sigatica clarkeana, "Euspira sabina" = Natica semilunata sabina, Sinum fiski Sigatica clarkeana Aldrich 1887 moon snail "Euspira sabina" = Natica semilunata sabina Palmer 1937 moon snail Sinum fiski moon snail
Neogastropoda - Fasciolariidae	Clavilithes sp. Clavilithes sp. Swainson 1840 snail "Clavilithes kennedyanus"
Neogastropoda - Buccinidae	"Pseudoliva scalina" = Popenoeum scalina, Pseudoliva vetusta "Pseudoliva scalina" = Popenoeum scalina Heilprin 1881 true whelk Pseudoliva vetusta Conrad 1833 true whelk Pseudoliva vetusta forma
Neogastropoda - Olividae	Ancilla staminea Ancilla staminea Conrad 1832 olive snail Ancilla staminea maternae
Neogastropoda - Volutidae	? Caricella heilprini, Athleta tuomeyi ? Caricella heilprini volute Athleta tuomeyi volute
Sorbeoconcha - Rostellariidae	Calyptraphorus trinodiferus Calyptraphorus trinodiferus snail
Bivalvia
Nuculanida - Nuculanidae	"Calorhadia pharcida" = Calorhadia (Calorhadia) pharcida "Calorhadia pharcida" = Calorhadia (Calorhadia) pharcida Dall 1898 pointed nut clam
Pectinida - Pectinoidae	Chlamys choctavensis Chlamys choctavensis Aldrich 1895 scallop
Ostreida - Ostreidae	? Odontogryphaea "sp. A", Ostrea sp. ? Odontogryphaea "sp. A" Ihering 1903 oyster Ostrea sp. Linnaeus 1758 oyster
Ostreida - Gryphaeidae	Gigantostrea sylvaerupis Gigantostrea sylvaerupis oyster
Arcida - Arcidae	Arca (Arca) hatchetigbeensis Arca (Arca) hatchetigbeensis Harris 1897 ark
Cardiida - Cardiidae	Nemocardium harrisi Nemocardium harrisi cockle
Cardiida - Tellinidae	Tellina subtriangularis Tellina subtriangularis tellin clam
Cardiida - Ungulinidae	Diplodonta hopkinsensis Diplodonta hopkinsensis clam
Cardiida - Veneridae	Pitar nuttalliopsis, Macrocallista sylvaerupis Pitar nuttalliopsis venus clam Macrocallista sylvaerupis venus clam
Pholadida - Corbulidae	Vokesula aldrichi Vokesula aldrichi Meyer 1885 clam
Carditida - Carditidae	Venericardia turneri, Venericardia sp., "Venericardia horatiana" = Venericardia (Venericor) horatiana, Venericardia bashiplata Venericardia turneri clam Venericardia sp. Lamarck 1801 clam "Venericardia horatiana" = Venericardia (Venericor) horatiana Gardner 1927 clam Venericardia bashiplata Gardner and Bowles 1939 clam
Carditida - Astartidae	Lirodiscus smithvillensis Lirodiscus smithvillensis Harris 1895 clam
Anthozoa
Scleractinia - Columastreidae	"Haimesastraea conferta" = Haimesiastraea "Haimesastraea conferta" = Haimesiastraea stony coral
Scleractinia - Dendrophylliidae	Balanophyllia desmophyllum, Balanophyllia haleana Balanophyllia desmophyllum Milne-Edwards and Haime 1848 stony coral Balanophyllia haleana Milne-Edwards and Haime 1848 stony coral