Where: Smith County, Mississippi (32.0° N, 89.5° W: paleocoordinates 32.3° N, 83.0° W)
• coordinate based on political unit
• outcrop-level geographic resolution
When: Mint Spring Formation, Rupelian (33.9 - 28.1 Ma)
• The Mint Spring Formation grades upward into the more calcareous sediments of the Marianna Limestone. Above the Mint Spring - Marianna contact, aragonitic shells generally have been leached leaving only the molds. The Marianna Limestone is only about two feet thick at Vicksburg, Mississippi and thickens eastward to forty-seven feet in Wayne County. In the latter area it is a soft limestone (lime mudstone and wackestone) with hard ledges in the lower part. In central and eastern Mississippi, it contains significant beds of calcareous sand. The Mint Spring- Marianna transgressive sequence began with the subsidence of Forest Hill delta systems. As the northern Gulf waters transgressed inland over the delta plain and estuarine enviroments, the Mint Spring Formation was deposited as a destructional shelf sand in the near-shore environments. Carbonates of the Marianna Limestone were deposited above this sand in the deeper waters of an offshore carbonate shelf.
• formation-level stratigraphic resolution
Environment/lithology: offshore; poorly lithified, sandy, calcareous lime mudstone and wackestone
Size class: mesofossils
Preservation: replaced with 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 5867: authorized by Linda Ivany, entered by Sarah DeLong on 09.12.1999
Creative Commons license: CC BY (attribution)
Taxonomic list
•Since taxa with greater than 99 specimens were not counted with absolute abundances, these were reported with category "A" for abundant.
unclassified | |
Gastropoda | |
Solariorbis sp. Conrad 1865 snail | |
Aclis matsoni n. sp.
Aclis matsoni n. sp. aclis | |
Calyptraea sp. Lamarck 1799 slipper shell | |
Epitonium ? sp. Bolten 1798 wentletrap | |
Seila sp. Adams 1861 snail | |
Cerithiella nassuloides n. sp.
Cerithiella nassuloides n. sp. snail | |
"Oliva mississippiensis" = Agaronia mississippiensis
"Oliva mississippiensis" = Agaronia mississippiensis Conrad 1848 snail | |
| |
Caricella reticulata volute | |
Mitra conquista mitre shell | |
Latirus protractus snail | |
Microsurcula mentha n. sp.
Microsurcula mentha n. sp. ribbed mitre | |
"Olssonella elongata n. sp." = Axelella, Agatrix mississippiensis
"Olssonella elongata n. sp." = Axelella snail
Agatrix mississippiensis nutmeg | |
| |
"Tropiscurcula caseyi" = Tropisurcula, Cochlespira cookei n. sp.
"Tropiscurcula caseyi" = Tropisurcula snail
Cochlespira cookei n. sp. snail | |
Syntomodrillia funis n. sp.
Syntomodrillia funis n. sp. snail | |
Ficus mississippiensis Conrad 1848 fig shell | |
Distorsio crassidens snail | |
Cyclostremiscus menthafons n. sp.
Cyclostremiscus menthafons n. sp. snail | |
"Creseis hastata" = Creseis spina
"Creseis hastata" = Creseis spina Reuss 1867 snail | |
Atys pinguis n. sp., Atys caseyi n. sp.
Atys pinguis n. sp. snail
Atys caseyi n. sp. snail | |
Odostomia byramensis n. sp., Turbonilla leafensis n. sp.
Odostomia byramensis n. sp. snail
Turbonilla leafensis n. sp. snail | |
| |
Acteon meyeri n. sp., Acteon menthafons n. sp.
Acteon meyeri n. sp. snail
Acteon menthafons n. sp. snail | |
Mathilda regularis Meyer 1886 snail | |
Bivalvia | |
| |
Crassinella variablis n. sp.
| |
"Venericardia carsonensis" = Venericardia (Rotundicardia) carsonensis
| |
Tellidorella interlacinia n. sp.
| |
Astarte menthifontis n. sp.
| |
| |
| |
| |
| |
| |
| |
Callista sobrina, Callista goniopisthus n. sp., "Chione victoria" = Lirophora (Lirophora) victoria, Pitar megacostata n. sp., Pitar calcanea, Pitar aldrichi n. sp.
| |
Kelliella rufaripa n. sp.
| |
"Chama mississippiensis" = Chama (Psilopus) mississippiensis
| |
"Diplodonta eburnea" = Diplodonta (Diplodonta) eburnea
| |
"Nemocardium diversum" = Nemocardium (Nemocardium) diversum, Trigoniocardia silvacollina n. sp., Agnocardia glebosum, Trachycardium eversum
| |
| |
Tellina subprotexta n. sp.
| |
| |
| |
| |
Crenella fenestra n. sp.
| |
| |
| |
| |
| |
| |
| |
"Pecten poulsoni" = Pecten (Pecten) poulsoni, "Eburneopecten subminutus" = Eburneopecten (Eburneopecten) subminutus, "Chlamys anatipes" = Anatipopecten anatipes, "Chlamys menthifontis" = Chlamys (Lyropecten) menthifontis
"Eburneopecten subminutus" = Eburneopecten (Eburneopecten) subminutus Aldrich 1903 scallop C category
| |
Scaphopoda | |
Cadulus quadriturritus tusk shell | |
Dentalium varicostata n. sp.
Dentalium varicostata n. sp. tusk shell | |
Merisca aequistriata | |
"Tellina lintea" = Merisca aequistriata
|