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 Red Bluff Formation as exposed is Clarke and Wayne counties, Mississippi, consists of fossiliferous, dark clay,silty clay,with zones of ironstone concretions in the lower part. These sediments disconformably overlie the blue-gray, blocky, marine clay of the Shubuta Clay Member of the Yazoo Formation and were deposited during in shallow marine shelf, prodelta, and marginal delta bay enviroments. Along the Chickasawhay River in Wayne County, the lower portion of the Red Bluff Formation is very fossiliferous. Well-preserved fossils in this basal zone occur in abundance in narrow, glauconitic, sand lenses within the clay. Irregular ironstone concretions occur along fosiliferous zones in the lower Red Bluff Formation and show up on electric logs as one or two "kicks" on the resistivity curve at the base of the formation.
• formation-level stratigraphic resolution
Environment/lithology: offshore; poorly lithified, gray, silty, sandy siltstone 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 5787: authorized by Linda Ivany, entered by Sarah DeLong on 02.12.1999, edited by Laurie Eccles
Creative Commons license: CC BY (attribution)
Taxonomic list
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•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.
Gastropoda | |
Confusiscala durhami n. sp.2
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Latirus aldrichi n. sp.2
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Bivalvia | |
Yoldia clydoniona n. sp.
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Corbula rufaripa n. sp., Corbula engonata
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"Chama mississippiensis" = Chama (Psilopus) mississippiensis
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Pitar aldrichi n. sp.
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"Venericardia carsonensis" = Venericardia (Rotundicardia) carsonensis
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Septifer probolus n. sp.
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"Eburneopecten subminutus" = Eburneopecten (Eburneopecten) subminutus, "Pecten perplanus" = Pecten (Pecten) perplanus, Spondylus dumosus
"Eburneopecten subminutus" = Eburneopecten (Eburneopecten) subminutus Aldrich 1903 scallop C category
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Plicatula variplicata n. sp.
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Anthozoa | |
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