MGS #112c (Oligocene of the United States)

Where: Warren County, Mississippi (32.5° N, 90.8° W: paleocoordinates 32.9° N, 84.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• The Byram Formation is fossiliferous in most places and clayey in other areas. 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 5999: 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.

 Dentaliida - Dentaliidae
Dentalium mississippiense Conrad 1848 tusk shell
 Arcida - Glycymerididae
Glycymeris arctata Conrad 1848 clam
R category
 Arcida - Arcidae
"Scapharca lesueuri" = Cunearca lesueuri, "Barbatia mississippiensis" = Barbatia (Cucullaearca) mississippiensis
"Scapharca lesueuri" = Cunearca lesueuri Dall 1848 ark
100+ valves collected
"Barbatia mississippiensis" = Barbatia (Cucullaearca) mississippiensis Conrad 1848 clam
R category
 Pectinida - Pectinoidae
Pecten byramensis scallop
100+ valves collected
Chlamys redwoodensis Dockery 1982 scallop
R category
 Mytilida - Mytilidae
Brachidontes mississippiensis Conrad 1848 mussel
C category
 Sorbeoconcha - Triphoridae
 Sorbeoconcha - Ficidae
Ficus mississippiensis Conrad 1848 fig shell
 Neogastropoda - Terebridae
Terebra divisura auger snail
Terebra tantula Conrad 1848 auger snail
 Neogastropoda - Conidae
"Conus alveatus" = Conus sauridens Conrad 1833 cone shell
 Neogastropoda - Turridae
Scobinella pluriplicata turrid
Scobinella pluriplicata subpluriplicata
Scobinella caelata Conrad 1848 turrid
"Coronia tenella" = Gemmula (Coronia) 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
Cymia subalveata murex snail
Siphonochelus curvirostratus Conrad 1848 murex snail
 Neogastropoda - Volutidae
Lyria mississippiensis Conrad 1843 volute
 Neogastropoda - Melongenidae
 Neogastropoda - Nassariidae
"Tritiaria mississippiensis" = Nassarius (Tritiaria)
"Tritiaria mississippiensis" = Nassarius (Tritiaria) snail
 Neogastropoda - Fasciolariidae
 Sorbeoconcha - Ranellidae
Cymatium vicksburgense n. sp. triton shell
 Sorbeoconcha - Cassidae
 Pseudomelanoidea - Pseudomelaniidae
Crassispira abundans Conrad 1840 snail
 Vanikoroidea - Aclididae
Aclis matsoni n. sp. aclis
 Opisthobranchia - Cylichnidae
Acteocina crassiplica barrel-bubble