MGS #35b (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 political unit

• outcrop-level geographic resolution

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

• The basal member of the VicksburGroup, the Red Bluff formation occurs just above the Yazoo Clay.

• formation-level stratigraphic resolution

Environment/lithology: prodelta; unlithified, gray, silty claystone and siltstone

• fossiliferous, dark gray, silty clay with zones of iron concretions in the lower part. also common, sandy lenses.

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 7113: authorized by Linda Ivany, entered by Elizabeth Kowalski on 26.04.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• bivalves only**abundances are given as counts ONLY for those species with fewer than 100 specimens - for 100 or more, he just gives "A" for "abundant". In the case where a collection includes an "A", we enter abundance classes for species instead of counts as follows: Fewer than 10 specimens = R (rare)10 to 99 specimens = C (common)Greater than 99 specimens(Dockery's "A") = A (abundant)In this reference, "specimens" equals "valves"
Show authors, comments, and common names
Gastropoda
 Sorbeoconcha - Ranellidae
Sassia conradiana
Sassia conradiana triton shell
 Neogastropoda - Muricidae
Siphonochelus curvirostratus, Pterynotus angelus, Murexiella vaughani n. sp.
Siphonochelus curvirostratus Conrad 1848 murex snail
Pterynotus angelus Aldrich 1886 murex snail
Murexiella vaughani n. sp. murex snail
 Neogastropoda - Turridae
Scobinella caelata
Scobinella caelata Conrad 1848 turrid
 Neogastropoda - Clavatulidae
Turricula longiforma
 Neogastropoda - Mitridae
Mitra conquista
Mitra conquista mitre shell
Bivalvia
 Carditida - Astartidae
Astarte triangulata
Astarte triangulata Meyer 1886 clam
 Cardiida - Veneridae
"Chione (Lirophora) victoria" = Lirophora (Lirophora) victoria
"Chione (Lirophora) victoria" = Lirophora (Lirophora) victoria Dall 1982 venus clam
Chione (Lirophora) victoria
 Pectinida - Dimyidae
Dimya rufaripa
Dimya rufaripa Vokes 1979 scallop
 Arcida - Arcidae
Scapharca invidiosa
Scapharca invidiosa Casey 1903 clam