MGS #99b (Oligocene of the United States)

Where: Rankin 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: Marianna Limestone Formation, Rupelian (33.9 - 28.1 Ma)

• Marianna Limeatone similar to Mint Spring Formation. Highly carbonaceous, here aragonitic shells generally have been leached leaving only the molds.

• formation-level stratigraphic resolution

Environment/lithology: offshore; lithified, conglomeratic, calcareous conglomerate and carbonate

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 5953: authorized by Linda Ivany, entered by Sarah DeLong on 04.01.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• list uses catagories. R = rare, 1-9 valves collected. C = common, 10-99 valves collected. A = abundant, 100+ valves collected. Actual values for the rare and common are listed in the comments section, actual values for the abundant valves are unknown.
Bivalvia
 Pectinida - Pectinoidae
"Pecten poulsoni" = Pecten (Pecten) poulsoni
"Pecten poulsoni" = Pecten (Pecten) poulsoni Morton 1834 scallop
100+ valves collected
Gastropoda
 Sorbeoconcha - Ranellidae
Sassia conradiana triton shell
Sassia conradiana menthafons
 Sorbeoconcha - Cassidae
Cassis flintensis Mansfield 1940 snail