MGS #94 (Oligocene of the United States)

Where: Smith County, Mississippi (32.0° N, 89.4° W: paleocoordinates 32.3° N, 82.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Byram Formation, Rupelian (33.9 - 28.1 Ma)

• The Byram Formation is fossiliferous, with clayey sands. Bivalves dominate Byram macrofauna.

• formation-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, shelly/skeletal, sandy, calcareous claystone and sandstone

Size class: mesofossils

Preservation: original aragonite, original calcite

Collection methods: bulk, mechanical,

• Bivalves only.

Primary reference: D. T. Dockery. 1982. Lower Oligocene Bivalvia of the Vicksburg Group in Mississippi. Mississippi Department of Natural Resources Bureau of Geology 123:1-261 [L. Ivany/S. DeLong/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 6003: authorized by Linda Ivany, entered by Sarah DeLong on 13.01.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• List uses catagories, for example, R = rare...1 - 9 valves collected. C = common...10 - 99 valves collected. A = abundant...100+ valves collected.

•Categories are listed in the comments field, absolute abundances are given in the abundance field.

•Since taxa with greater than 99 specimens were not counted with absolute abundances, these were reported with category "A" for abundant.

Scaphopoda
 Dentaliida - Dentaliidae
Dentalium mississippiense Conrad 1848 tusk shell
Bivalvia
 Carditida - Astartidae
Astarte triangulata Meyer 1886 clam
R category
 Carditida - Crassatellidae
Crassinella variablis n. sp. Dockery 1982 clam
100+ valves collected
 Poromyida - Verticordiidae
Verticordia dalliana clam
R category
 Thraciida - Periplomatidae
Periploma macneili n. sp. clam
R category
 Cardiida - Veneridae
Chamelea mississippiensis venus clam
C category
Pitar imitabilis venus clam
R category
Callista sobrina venus clam
C category
 Cardiida - Mactridae
Spisula funerata clam
R category
 Cardiida - Kelliidae
Bornia tallahalaensis n. sp. Dockery 1982 clam
R category
 Cardiida - Tellinidae
Tellina vicksburgensis Conrad 1848 tellin clam
R category
 Cardiida - Semelidae
Ervilia lamelloexteria n. sp. clam
C category
Semelina pilsbryi clam
R category
 Cardiida - Cardiidae
Dinocardium vicksburgensis cockle
R category
 Pholadida - Corbulidae
Corbula engonata, "Corbula laqueata" = Varicorbula laqueata
Corbula engonata Conrad 1848 clam
100+ valves collected
"Corbula laqueata" = Varicorbula laqueata Casey 1903 clam
C category
 Lucinida - Lucinidae
Lucina varisculpta n. sp. Dockery 1982 clam
100+ valves collected
 Arcida - Arcidae
"Scapharca lesueuri" = Cunearca lesueuri
"Scapharca lesueuri" = Cunearca lesueuri Dall 1848 ark
100+ valves collected
 Pectinida - Pectinoidae
"Eburneopecten subminutus" = Eburneopecten (Eburneopecten) subminutus Aldrich 1903 scallop
R category
Pecten byramensis scallop
R category
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
R category
 Mytilida - Mytilidae
Brachidontes mississippiensis Conrad 1848 mussel
R category
 Nuculida - Nuculidae
Nucula vicksburgensis Conrad 1848 nut clam
100+ valves collected
 Nuculanida - Yoldiidae
Yoldia serica Conrad 1848 clam
R category