MGS #39 (Oligocene of the United States)

Where: Wayne County, Mississippi (31.7° N, 88.7° W: paleocoordinates 31.9° N, 82.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Red Bluff Formation, Rupelian (33.9 - 28.1 Ma)

• Red Bluff formation is exposed in Clark and Wayne counties, Mississippi. It consists of fossiliferous, dark grey, silty clay with zones of ironstone concentrations in lower part.These sediments conformably overlie the blue-grey, blocky, marine clay of the Shubuta Clay Member of the Yazoo Formation and were deposited in shallow marine shelf, prodelta, and marginal delta bay enviroments. Lower part of the Red Bluff Formation is the most fossiliferous. Otoliths are also abundant here.

• formation-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, gray, silty claystone and ironstone

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 5779: authorized by Linda Ivany, entered by Sarah DeLong on 30.11.1999, edited by Laurie Eccles

Creative Commons license: CC BY (attribution)

Taxonomic list

• Because author denoted all species that he found more than 99 individuals as abundant or "A", I've used a similar system on the taxonomic list. 1- 9 individuals rare (R), 10 -99 (C) common, and 99+ (A) abundant like the author had before. 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.

Bivalvia
 Nuculanida - Yoldiidae
Yoldia clydoniona n. sp. Dockery 1982 clam
R category
 Lucinida - Lucinidae
Myrtea scopularis Casey 1903 clam
R category
 Cardiida - Chamidae
Chama pappiladerma n. sp. Dockery 1982 jewel box
R category
 Cardiida - Veneridae
"Ventricolaria ucuttana" = Globivenus, Pitar aldrichi n. sp.
"Ventricolaria ucuttana" = Globivenus venus clam
R category
Pitar aldrichi n. sp. venus clam
R category
 Cardiida - Semelidae
Abra pectorosa abra
R category
 Cardiida - Cardiidae
Agnocardia glebosum Conrad 1848 cockle
R category
Nemocardium eocenense Meyer 1887 cockle
C category
 Pholadida - Corbulidae
Corbula rufaripa n. sp. clam
99+ valves collected
Corbula engonata Conrad 1848 clam
R category
 Pholadida - Pholadidae
Jouannetia triquetra clam
R category
 Carditida - Astartidae
Astarte triangulata Meyer 1886 clam
C category
 Carditida - Carditidae
"Venericardia carsonensis" = Venericardia (Rotundicardia) carsonensis
"Venericardia carsonensis" = Venericardia (Rotundicardia) carsonensis Dall 1903 clam
R category
 Arcida - Glycymerididae
Glycymeris intercostata Gabb 1860 clam
R category
 Arcida - Arcidae
Scapharca invidiosa Casey 1903 clam
R category
 Ostreida - Ostreidae
Lopha vicksburgensis Conrad 1848 oyster
R category
Ostrea paroxis Lesueur 1829 oyster
R category
 Pectinida - Pectinoidae
"Spondylus dumosus" = Spondylus dumosus, "Spondylus (Spondylus) dumosus" = Spondylus dumosus1, Chlamys cocoana, "Pecten perplanus" = Pecten (Pecten) perplanus
"Spondylus dumosus" = Spondylus dumosus Morton 1834 scallop
R category
"Spondylus (Spondylus) dumosus" = Spondylus dumosus1 Morton 1834 scallop
Chlamys cocoana scallop
R category
"Pecten perplanus" = Pecten (Pecten) perplanus Morton 1833 scallop
R category
Scaphopoda
 Dentaliida - Dentaliidae
Gastropoda
 Cerithioidea - Turritellidae
Turritella rubricollis n. sp.2 turret shell
 Sorbeoconcha - Naticidae
Sinum cf. danvillense2 Harris and Palmer 1947 moon snail
 Sorbeoconcha - Ficidae
Ficus mississippiensis2 Conrad 1848 fig shell
 Sorbeoconcha - Cassidae
"Galeodea (Mambrinia) brevidentata" = Galeodea1, Sconsia prelintea n. sp.2
"Galeodea (Mambrinia) brevidentata" = Galeodea1 snail
Sconsia prelintea n. sp.2 snail
 Sorbeoconcha - Ranellidae
Sassia conradiana2 triton shell
 Neogastropoda - Borsoniidae
Bathytoma rhomboidea2 snail
Bathytoma rhomboidea lyrata
 Neogastropoda - Clathurellidae
 Neogastropoda - Clavatulidae
 Neogastropoda - Cochlespiridae
Cochlespira cookei2 snail
Cochlespira cookei rubracollis
 Neogastropoda - Turridae
Gemmula amica2 Casey 1903 turrid
 Neogastropoda - Volutidae
 Neogastropoda - Muricidae
Siphonochelus curvirostratus2 Conrad 1848 murex snail
 Neogastropoda - Costellariidae
Conomitra vicksburgensis2 ribbed mitre
Conomitra vicksburgensis laevigata
Vexillum lintoidea2 ribbed mitre
 Neogastropoda - Cancellariidae
 Neogastropoda - Fasciolariidae
 Neogastropoda - Nassariidae
"Tritiaria macilenta" = Nassarius (Tritiaria)2
"Tritiaria macilenta" = Nassarius (Tritiaria)2 snail
 Neogastropoda - Buccinidae
Metula fastidiosa2 true whelk
Metula inflata n. sp.2 true whelk
Metula neptuneiformis n. sp.2 true whelk
 Neogastropoda - Melongenidae
 Neogastropoda - Mitridae
"Mitra (Fusimitra) conquisita" = Fusimitra conquisita1, Mitra mississippiensis2
"Mitra (Fusimitra) conquisita" = Fusimitra conquisita1 Conrad 1848 mitre shell
Mitra mississippiensis2 Conrad 1848 mitre shell
 Heterostropha - Acteonidae
Tornatellaea sp.2 Conrad 1860 snail
 Heterostropha - Pyramidellidae
 Thecosomata - Limacinidae
Limacina sp.2 Bosc 1817 snail
Anthozoa
 Scleractinia - Dendrophylliidae
Balanophyllia (Balanophyllia) elongata1 Vaughan 1900 stony coral