MGS #35 Sample 5: Rupelian, Mississippi

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Nuculida - Nuculidae
2 individuals
Bivalvia - Nuculanida - Yoldiidae
5 individuals
Bivalvia - Pholadida - Corbulidae
161 individuals
Bivalvia - Cardiida - Cardiidae
1 individual
Bivalvia - Poromyida - Spheniopsidae
5 individuals
Bivalvia - Poromyida - Verticordiidae
1 individual
Bivalvia - Carditida - Astartidae
17 individuals
Bivalvia - Arcida - Glycymerididae
Glycymeris sp. Da Costa 1778
1 individual
Bivalvia - Arcida - Arcidae
Scapharca invidiosa (Casey 1903)
30 individuals
1 individual
Bivalvia - Arcida - Limopsidae
Limopsis sp. Sassi 1827
1 individual
Bivalvia - Pectinida - Limidae
Limaria sp. Link 1807
1 individual
Bivalvia - Pectinida - Spondylidae
Spondylus dumosus (Morton 1834)
5 individuals
Bivalvia - Pectinida - Pectinidae
1 individual
15 individuals
Bivalvia - Pectinida - Dimyidae
Dimya rufaripa Vokes 1979
12 individuals
Bivalvia - Ostreida - Pteriidae
6 individuals
Scaphopoda - Gadilida - Gadilidae
1 individual
Scaphopoda - Dentaliida - Dentaliidae
6 individuals
Gastropoda - Neogastropoda - Columbellidae
Mitrella sp. Risso 1826
5 individuals
Gastropoda - Neogastropoda - Mitridae
1 individual
Gastropoda - Neogastropoda - Turridae
1 individual
unclassified
3 individuals
Gastropoda - Neogastropoda - Turridae
Gemmula amica Casey 1903
9 individuals
Gastropoda - Neogastropoda - Drilliidae
2 individuals
Gastropoda - Neogastropoda - Muricidae
4 individuals
unclassified
12 individuals
Gastropoda - Naticidae
12 individuals
Gastropoda - Vitrinellidae
1 individual
Gastropoda - Tornidae
Teinostoma sp. Adams and Adams 1853
1 individual
Gastropoda - Turritellidae
38 individuals
Gastropoda - Heterostropha - Pyramidellidae
1 individual
Gastropoda - Opisthobranchiata - Cylichnidae
1 individual
Gastropoda - Heterostropha - Ringiculidae
3 individuals
see common names

Geography
Country:United States State/province:Mississippi County:Wayne
Coordinates: 31.7° North, 88.7° West (view map)
Paleocoordinates:35.3° North, 75.6° West (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Oligocene
Stage: Rupelian 10 m.y. bin: Cenozoic 4
Key time interval: Rupelian
Age range of interval: 33.9 - 27.3 m.y. ago
Stratigraphy
Geological group:Vicksburg Formation:Red Bluff
Stratigraphic resolution:formation
Stratigraphy comments: Sample Level 5 1m above base of red bluff formation.


The basal member of the Vicksburg Group, the Red Bluff formation occurs just above the Yazoo Clay.

The contact between the Yazoo clay and the overlying silty glauconitic Red Bluff formation is abrupt and contains the features of a typical disconformable transgressive contact
Lithology and environment
Primary lithology:glauconitic,gray unlithified silty claystone
Secondary lithology: siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: the contact between the Yazoo clay and the Red Bluff formation "includes lenses of glauconite, bored encrusted pebbles and burrows that pipe the Red Blugg into the underlying Yazoo. Sparsley fossiliferous blue gray clay
Environment:marine indet. Tectonic setting:passive margin
Geology comments: deeper water following transgressive event
Taphonomy
Modes of preservation:body,original aragonite,original calcite
Size of fossils:mesofossils
Collection methods and comments
Collection excludes:all microfossils,some macrofossils
Collection methods:bulk,mechanical,field collection
Reason for describing collection:paleoecologic analysis
Collection method comments: molluscs only---Samples were dried and washed through 1.00m sieves. Wet sieved with minimal breakage. Random subsamples of the washed shell material were taken and completely picked for all identifiable shells including bivalve beaks and gastropod apices. All bivalve beaks were counted and then divided by two. Each gastropod apex was counted as one individual.
Taxonomic list comments:molluscs only
Metadata
Database number:74081
Authorizer:A. Miller Enterer:K. Bulinski
Modifier:J. Sessa Research group:GCP,marine invertebrate
Created:2007-07-20 14:50:02 Last modified:2025-02-22 15:12:02
Access level:the public Released:2007-07-20 14:50:02
Creative Commons license:CC0
Reference information

Primary reference:
24875. T. A. Hansen, P.H. Kelley, and D.M. Haasl. 2004. Paleoecological patterns in molluscan extinctions and recoveries: comparison of the Cretaceous-Paleogene and Eocene-Oligocene extinctions in North America. Palaeogeography, Palaeoclimatology, Palaeoecology 214:233-242 [A. Miller/K. Bulinski]