MGS #35/#38 Sample 2: Rupelian, Mississippi

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Tritaria falsus
20 individuals
Gastropoda - Eulimidae
Strombiformis caseyi
1 individual
Gastropoda - Turritellidae
Turritella aff. premimetes
26 individuals
Gastropoda - Neotaenioglossa - Calyptraeidae
Calyptraea cf. aperta (Solander 1766)
7 individuals
Gastropoda - Vitrinellidae
Vitrinella laevis
3 individuals
Gastropoda - Neogastropoda - Costellariidae
Vexillum lintoidea
2 individuals
Gastropoda - Neogastropoda - Mitridae
Mitra conquista
1 individual
Gastropoda - Neogastropoda - Cochlespiridae
Tropiscurcula caseyi
9 individuals
Gastropoda - Neogastropoda - Conidae
Conus alveatus Conrad 1865
1 individual
Gastropoda - Neogastropoda - Drilliidae
Syntomodrillia collarubra
3 individuals
Gastropoda - Neogastropoda - Turridae
Scobinella caelata Conrad 1848
1 individual
Gemmula amica Casey 1903
35 individuals
Gastropoda - Neogastropoda - Borsoniidae
Microdrillia infans
5 individuals
Bathytoma rhomboidea
4 individuals
Gastropoda - Neogastropoda - Columbellidae
Mitrella sp. Risso 1826
1 individual
Gastropoda - Neogastropoda - Melongenidae
Levifusus spiniger
2 individuals
Gastropoda - Naticidae
Natica caseyi
29 individuals
Gastropoda - Heterostropha - Architectonicidae
Architectonica sp. Röding 1798
2 individuals
Gastropoda - Heterostropha - Ringiculidae
Ringicula mississippiensis Conrad 1848
12 individuals
Gastropoda - Heterostropha - Acteonidae
Acteon subaldrichi
4 individuals
Gastropoda - Opisthobranchia - Cylichnidae
Scaphander primus
2 individuals
Acteocina crassiplica
1 individual
subspecies altispira
Gastropoda - Opisthobranchia - Haminoeidae
Atys caseyi
2 individuals
Scaphopoda - Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758
9 individuals
Scaphopoda - Gadilida - Gadilidae
Cadulus sp. Philippi 1844
74 individuals
Species A (62 Individuals & Species B together (12 individuals)
Bivalvia - Pectinida - Pectinidae
Eburneopecten subminutus (Aldrich 1903)
7 individuals
Chlamys cocoana
5 individuals
Bivalvia - Pectinida - Dimyidae
Dimya rufaripa Vokes 1979
2 individuals
Bivalvia - Ostreida - Pteriidae
Pteria argentea (Conrad 1848)
2 individuals
Bivalvia - Arcida - Arcidae
Scapharca invidiosa (Casey 1903)
89 individuals
Bivalvia - Poromyida - Verticordiidae
Verticordia dalliana
5 individuals
Haliris quadrangularis
3 individuals
Bivalvia - Poromyida - Spheniopsidae
Spheniopsis mississippiensis
1 individual
Bivalvia - Pholadida - Corbulidae
Corbula rufaripa
94 individuals
Corbula engonata Conrad 1848
5 individuals
Bivalvia - Cardiida - Kelliellidae
Kelliella rufaripa
15 individuals
Bivalvia - Cardiida - Veneridae
Chione victoria (Dall 1982)
1 individual
Pitar aldrichi
3 individuals
Bivalvia - Cardiida - Cardiidae
Nemocardium eocenense (Meyer 1887)
6 individuals
Bivalvia - Lucinida - Lucinidae
Myrtaea scopularis
12 individuals
Lucina varisculpta Dockery 1982
1 individual
Bivalvia - Carditida - Carditidae
Venericardia carsonensis Dall 1903
1 individual
Bivalvia - Carditida - Astartidae
Astarte triangulata Meyer 1886
48 individuals
Bivalvia - Nuculanida - Yoldiidae
Yoldia clydoniona Dockery 1982
15 individuals
Bivalvia - Nuculida - Nuculidae
Nucula vicksburgensis Conrad 1848
10 individuals
see common names

Geography
Country:United States State/province:Mississippi County:Wayne
Coordinates: 31.7° North, 88.7° West (view map)
Paleocoordinates:31.9° North, 82.2° West
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 - 27.82 m.y. ago
Stratigraphy
Geological group:Vicksburg Formation:Red Bluff
Stratigraphic resolution:formation
Stratigraphy comments: Sample Level 2 15cm 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:74078
Authorizer:A. Miller Enterer:K. Bulinski
Modifier:J. Sessa Research group:GCP,marine invertebrate
Created:2007-07-20 14:47:59 Last modified:2010-08-10 14:27:01
Access level:the public Released:2007-07-20 14:47:59
Creative Commons license:CC BY
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]