MGS #106a (Oligocene of the United States)

Where: Hinds County, Mississippi (32.2° N, 90.2° W: paleocoordinates 32.5° N, 83.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• The Byram Formation is fossiliferous and has some clayey sands. Macrofauna is 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 6005: authorized by Linda Ivany, entered by Sarah DeLong on 13.01.2000, edited by Laurie Eccles

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.
Samelina pilsbryi
1 valve collected
 Dentaliida - Dentaliidae
Dentalium strenuum2 tusk shell
Dentalium mississippiense2 Conrad 1848 tusk shell
 Gadilida - Gadilidae
 Carditida - Astartidae
Astarte menthifontis n. sp. Dockery 1982 clam
6 valves collected
Astarte triangulata Meyer 1886 clam
1 valve collected
Astarte triangulata1 Meyer 1886 clam
 Carditida - Crassatellidae
"Crassatella mississippiensis" = Crassatella (Crassatella) mississippiensis, Crassinella variablis n. sp.
"Crassatella mississippiensis" = Crassatella (Crassatella) mississippiensis Conrad 1848 clam
100+ valves collected
Crassinella variablis n. sp. Dockery 1982 clam
100+ valves collected
 Poromyida - Spheniopsidae
Spheniopsis mississippiensis clam
1 valve collected
 Poromyida - Verticordiidae
Verticordia dalliana clam
4 valves collected
 Cardiida - Sportellidae
Sportella oblonga Conrad 1848 clam
1 valve collected
 Cardiida - Veneridae
Chamelea mississippiensis venus clam
8 valves collected
Pitar perbrevis venus clam
6 valves collected
Pitar protena n. sp. venus clam
2 valves collected
Pitar imitabilis venus clam
37 valves collected
Pitar semipunctata venus clam
3 valves collected
"Chione bainbridgensis" = Chione (Chionopsis) bainbridgensis Dall 1916 venus clam
7 valves collected
Chione perbrevisformis n. sp. venus clam
2 valves collected
Callista sobrina venus clam
100+ valves collected
 Cardiida - Ungulinidae
"Diplodonta eburnea" = Diplodonta (Diplodonta) eburnea Conrad 1848 clam
1 valve collected
Timothynus turgida Conrad 1848 clam
1 valve collected
 Cardiida - Mactridae
Spisula funerata clam
4 valves collected
 Cardiida - Kelliidae
Bornia tallahalaensis n. sp. Dockery 1982 clam
1 valve collected
 Cardiida - Tellinidae
Tellina vicksburgensis Conrad 1848 tellin clam
63 valves collected
 Cardiida - Semelidae
Ervilia lamelloexteria n. sp. clam
100+ valves collected
Semele staminea clam
2 valves collected
 Cardiida - Cardiidae
"Nemocardium diversum" = Nemocardium (Nemocardium) diversum Conrad 1848 cockle
18 valves collected
Dinocardium vicksburgensis cockle
13 valves collected
 Pholadida - Corbulidae
Corbula engonata, "Corbula laqueata" = Varicorbula laqueata
Corbula engonata Conrad 1848 clam
24 valves collected
"Corbula laqueata" = Varicorbula laqueata Casey 1903 clam
100+ valves collected
 Hiatellida - Hiatellidae
Panopea oblongata Conrad 1848 clam
4 valves collected
 Lucinida - Lucinidae
Lucina posteocurta n. sp. Dockery 1982 clam
100+ valves collected
Lucina fimbripallium n. sp. Dockery 1982 clam
4 valves collected
 Arcida - Glycymerididae
Glycymeris mississippiensis Conrad 1848 clam
12 valves collected
 Arcida - Arcidae
"Scapharca lesueuri" = Cunearca lesueuri, Barbatia lima, "Barbatia mississippiensis" = Barbatia (Cucullaearca) mississippiensis
"Scapharca lesueuri" = Cunearca lesueuri Dall 1848 ark
100+ valves collected
Barbatia lima Conrad 1848 clam
6 valves collected
"Barbatia mississippiensis" = Barbatia (Cucullaearca) mississippiensis Conrad 1848 clam
5 valves collected
 Pectinida - Limidae
Limaria staminea Conrad 1848 file clam
1 valve collected
 Pectinida - Pectinoidae
"Eburneopecten subminutus" = Eburneopecten (Eburneopecten) subminutus Aldrich 1903 scallop
5 valves collected
Pecten byramensis scallop
100+ valves collected
 Ostreida - Ostreidae
Lopha vicksburgensis Conrad 1848 oyster
6 valves collected
Ostrea paroxis Lesueur 1829 oyster
36 valves collected
 Ostreida - Pinnidae
Atrina argentea Conrad 1848 oyster
10 valves collected
 Ostreida - Pteriidae
Pteria argentea Conrad 1848 pearl oyster
1 valve collected
 Nuculida - Nuculidae
Nucula vicksburgensis Conrad 1848 nut clam
3 valves collected
 Nuculanida - Nuculanidae
Nuculana akidota Dockery 1982 pointed nut clam
14 valves collected
 Nuculanida - Yoldiidae
Yoldia serica Conrad 1848 clam
3 valves collected
 Cerithioidea - Litiopidae
Alaba macneili n. sp.2 snail
 Cerithioidea - Cerithiidae
Bittium ottoi n. sp.2
Bittium ottoi n. sp.2 cerith snail
 Epitonioidea - Epitoniidae
Scalina trigintanaria2 Conrad 1848 wentletrap
Epitonium ? sp.2 Bolten 1798 wentletrap
Pliciscala caseyi n. sp.2 wentletrap
Pliciscala byramensis n. sp.2 wentletrap
 Sorbeoconcha - Tornidae
Teinostoma minuta n. sp.2 snail
 Sorbeoconcha - Vitrinellidae
 Sorbeoconcha - Triforidae
Cerithiella sp.2 Verrill 1882 snail
 Sorbeoconcha - Ficidae
Ficus mississippiensis2 Conrad 1848 fig shell
 Neogastropoda - Terebridae
Terebra divisura2 auger snail
Terebra tantula2 Conrad 1848 auger snail
 Neogastropoda - Clavatulidae
Turricula byramensis n. sp.2 snail
 Neogastropoda - Drilliidae
Syntomodrillia tantula2 Conrad 1843 snail
 Neogastropoda - Cochlespiridae
"Tropiscurcula caseyi" = Tropisurcula2
"Tropiscurcula caseyi" = Tropisurcula2 snail
 Neogastropoda - Conidae
"Conus alveatus" = Conus sauridens2, Conorbis porcellanus2
"Conus alveatus" = Conus sauridens2 Conrad 1833 cone shell
 Neogastropoda - Turridae
Scobinella pluriplicata2 turrid
Scobinella pluriplicata subpluriplicata
Scobinella caelata2 Conrad 1848 turrid
"Cochlespira cristata" = Pleurotoma cristata2 Conrad 1848 turrid
"Coronia tenella" = Gemmula (Coronia)2 turrid
 Neogastropoda - Raphitomidae
 Neogastropoda - Borsoniidae
 Neogastropoda - Mitridae
Mitra conquista2 mitre shell
Mitra mississippiensis2 Conrad 1848 mitre shell
 Neogastropoda - Olivellidae
"Oliva mississippiensis" = Agaronia mississippiensis2
"Oliva mississippiensis" = Agaronia mississippiensis2 Conrad 1848 snail
 Neogastropoda - Olividae
Oliva affluens2 olive snail
 Neogastropoda - Costellariidae
Vexillum cellulifera2 ribbed mitre
Microsurcula intacta2 ribbed mitre
 Neogastropoda - Turbinellidae
Turbinella wilsoni2 Conrad 1848 snail
 Neogastropoda - Muricidae
Chicoreus dormani2 murex snail
Siphonochelus curvirostratus2 Conrad 1848 murex snail
 Neogastropoda - Harpidae
Harpa vicksburgiana n. sp.2 snail
 Neogastropoda - Volutidae
Lyria isabellae2 Maury 1910 volute
Lyria isabellae modesta
Lyria mississippiensis2 Conrad 1843 volute
Caricella demissa2 Conrad 1848 volute
 Neogastropoda - Buccinidae
Pseudofulgur lirata n. gen. n. sp.2
Pseudofulgur lirata n. gen. n. sp.2 true whelk
 Neogastropoda - Melongenidae
 Neogastropoda - Nassariidae
"Tritiaria mississippiensis" = Nassarius (Tritiaria)2
"Tritiaria mississippiensis" = Nassarius (Tritiaria)2 snail
 Neogastropoda - Fasciolariidae
Dolicholatirus exilis2 Gabb 1873 snail
Dolicholatirus exilis confertus
 Sorbeoconcha - Cassidae
Sconsia lintea2 Conrad 1848 snail
 Sorbeoconcha - Personidae
 Sorbeoconcha - Eocypraeidae
Sulcocypraea lintea2 Conrad 1848 snail
 Sorbeoconcha - Cypraeidae
Cypraeorbis sphaeroides2 Conrad 1848 cowry
 Sorbeoconcha - Aporrhaidae
 Pseudomelanoidea - Pseudomelaniidae
Crassispira abundans2 Conrad 1840 snail
 Vanikoroidea - Aclididae
Aclis sp.2 Loven 1846 aclis
 Heterostropha - Acteonidae
Acteon sp.2 Montfort 1810 snail
 Heterostropha - Ringiculidae
Ringicula mississippiensis2 Conrad 1848 snail
including Ringicula mississippiensis petila
 Heterostropha - Pyramidellidae
Odostomia byramensis n. sp.2 snail
Turbonilla leafensis n. sp.2 snail
Eulimella clearyensis n. sp.2 snail
 Opisthobranchia - Cylichnidae
Acteocina crassiplica2 barrel-bubble
 Thecosomata - Cavoliniidae
"Creseis hastata" = Creseis spina2
"Creseis hastata" = Creseis spina2 Reuss 1867 snail