MGS #109 (Oligocene of the United States)

Where: Warren County, Mississippi (32.3° N, 90.9° W: paleocoordinates 32.7° N, 84.3° W)

• coordinate based on political unit

• outcrop-level geographic resolution

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

• The Byram Formation is fossiliferous in most places, and clayey in others. Macrofauna dominated by bivalves.

• 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 6006: 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.
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium mississippiense Conrad 1848 tusk shell
Bivalvia
 Carditida - Astartidae
Astarte menthifontis n. sp. Dockery 1982 clam
1 valves
 Carditida - Crassatellidae
"Crassatella mississippiensis" = Crassatella (Crassatella) mississippiensis
"Crassatella mississippiensis" = Crassatella (Crassatella) mississippiensis Conrad 1848 clam
2 valves
 Poromyida - Verticordiidae
Verticordia dalliana clam
1 valves
 Cardiida - Sportellidae
Sportella oblonga Conrad 1848 clam
1 valves
 Cardiida - Veneridae
Chamelea mississippiensis venus clam
4 valves
Callista sobrina venus clam
43 valves
 Cardiida - Semelidae
Ervilia lamelloexteria n. sp. clam
2 valves
Semelina pilsbryi clam
2 valves
 Cardiida - Cardiidae
"Nemocardium diversum" = Nemocardium (Nemocardium) diversum
"Nemocardium diversum" = Nemocardium (Nemocardium) diversum Conrad 1848 cockle
8 valves
 Pholadida - Corbulidae
Corbula engonata Conrad 1848 clam
>100 valves
 Hiatellida - Hiatellidae
Panopea oblongata Conrad 1848 clam
2 valves
 Lucinida - Lucinidae
Lucina posteocurta n. sp. Dockery 1982 clam
1 valves
Lucina triloba n. sp. Dockery 1982 clam
1 valves
 Arcida - Glycymerididae
Glycymeris arctata Conrad 1848 clam
6 valves
 Arcida - Arcidae
"Scapharca lesueuri" = Cunearca lesueuri, "Barbatia mississippiensis" = Barbatia (Cucullaearca) mississippiensis
"Scapharca lesueuri" = Cunearca lesueuri Dall 1848 ark
>100 valves
"Barbatia mississippiensis" = Barbatia (Cucullaearca) mississippiensis Conrad 1848 clam
4 valves
 Pectinida - Pectinoidae
Pecten byramensis scallop
>100 valves
 Ostreida - Pinnidae
Atrina argentea Conrad 1848 oyster
2 valves
 Mytilida - Crenellidae
Crenella fenestra n. sp. Dockery 1982 clam
1 valves
 Mytilida - Mytilidae
Brachidontes mississippiensis Conrad 1848 mussel
7 valves
 Nuculanida - Nuculanidae
Nuculana akidota n. sp. Dockery 1982 pointed nut clam
1 valve
 Nuculanida - Yoldiidae
Yoldia serica Conrad 1848 clam
22 valves
Gastropoda
 Neogastropoda - Terebridae
Terebra divisura auger snail
Terebra tantula Conrad 1848 auger snail
 Neogastropoda - Cochlespiridae
"Tropiscurcula caseyi" = Tropisurcula
"Tropiscurcula caseyi" = Tropisurcula snail
 Neogastropoda - Conidae
"Conus alveatus" = Conus sauridens Conrad 1833 cone shell
 Neogastropoda - Turridae
Scobinella pluriplicata turrid
Scobinella pluriplicata subpluriplicata
Scobinella caelata Conrad 1848 turrid
 Neogastropoda - Borsoniidae
 Neogastropoda - Olivellidae
"Oliva mississippiensis" = Agaronia mississippiensis
"Oliva mississippiensis" = Agaronia mississippiensis Conrad 1848 snail
 Neogastropoda - Olividae
Oliva affluens olive snail
 Neogastropoda - Turbinellidae
Turbinella wilsoni Conrad 1848 snail
 Neogastropoda - Muricidae
Siphonochelus curvirostratus Conrad 1848 murex snail
 Neogastropoda - Buccinidae
 Neogastropoda - Nassariidae
"Tritiaria mississippiensis" = Nassarius (Tritiaria)
"Tritiaria mississippiensis" = Nassarius (Tritiaria) snail
 Neogastropoda - Fasciolariidae
 Sorbeoconcha - Cassidae
"Galeodaria tricarinata" = Galeodea snail
Phalium mississippiensis Conrad 1848 snail
 Sorbeoconcha - Personidae
 Pseudomelanoidea - Pseudomelaniidae
Crassispira abundans Conrad 1840 snail