MGS #35 Sample 7: Rupelian, Mississippi

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Tritaria falsus
25 individuals
Gastropoda - Eulimidae
Strombiformis caseyi
2 individuals
Gastropoda - Turritellidae
Turritella aff. premimetes
47 individuals
Gastropoda - Neotaenioglossa - Calyptraeidae
Calyptraea cf. aperta (Solander 1766)
1 individual
Gastropoda - Tornidae
Teinostoma caseyi
1 individual
Gastropoda - Triforidae
Cerithiella langdoni
1 individual
Gastropoda - Neogastropoda - Mitridae
Mitra conquista
6 individuals
Gastropoda - Neogastropoda - Drilliidae
Syntomodrillia collarubra
2 individuals
Gastropoda - Neogastropoda - Turridae
Gemmula amica Casey 1903
12 individuals
Gastropoda - Neogastropoda - Borsoniidae
Microdrillia infans
3 individuals
Gastropoda - Neogastropoda - Columbellidae
Mitrella sp. Risso 1826
1 individual
Gastropoda - Neogastropoda - Muricidae
Urosalpinx aspinosus
2 individuals
Gastropoda - Neogastropoda - Volutidae
Caricella reticulata
2 individuals
Gastropoda - Naticidae
Natica caseyi
39 individuals
Gastropoda - Heterostropha - Architectonicidae
Architectonica hargeri
1 individual
Gastropoda - Heterostropha - Ringiculidae
Ringicula mississippiensis Conrad 1848
4 individuals
Gastropoda - Heterostropha - Acteonidae
Acteon subaldrichi
1 individual
Gastropoda - Heterostropha - Pyramidellidae
Eulimella clearyensis
4 individuals
Scaphopoda - Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758
5 individuals
Scaphopoda - Gadilida - Gadilidae
Cadulus sp. Philippi 1844
28 individuals
sp. B
Bivalvia - Pectinida - Pectinidae
Eburneopecten subminutus (Aldrich 1903)
41 individuals
Pecten perplanus Morton 1833
1 individual
Bivalvia - Arcida - Arcidae
Scapharca invidiosa (Casey 1903)
62 individuals
Bivalvia - Poromyida - Verticordiidae
Verticordia dalliana
4 individuals
Bivalvia - Pholadida - Corbulidae
Corbula rufaripa
517 individuals
Corbula engonata Conrad 1848
1 individual
Bivalvia - Cardiida - Kelliellidae
Kelliella rufaripa
19 individuals
Bivalvia - Cardiida - Veneridae
Chione victoria (Dall 1982)
1 individual
Pitar aldrichi
5 individuals
Bivalvia - Cardiida - Chamidae
Chama sp. Linnaeus 1758
1 individual
Bivalvia - Cardiida - Cardiidae
Nemocardium eocenense (Meyer 1887)
4 individuals
Bivalvia - Cardiida - Semelidae
Ervilia exterolaevis
2 individuals
Bivalvia - Lucinida - Lucinidae
Myrtaea scopularis
10 individuals
Bivalvia - Carditida - Carditidae
Venericardia carsonensis Dall 1903
2 individuals
Bivalvia - Carditida - Crassatellidae
Crassinella variablis Dockery 1982
2 individuals
Bivalvia - Carditida - Astartidae
Astarte triangulata Meyer 1886
42 individuals
Bivalvia - Nuculanida - Yoldiidae
Yoldia clydoniona Dockery 1982
12 individuals
Bivalvia - Nuculida - Nuculidae
Nucula vicksburgensis Conrad 1848
16 individuals
Brevinucula pseudopunctata Dockery 1982
5 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 7 3.5m 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:74083
Authorizer:A. Miller Enterer:K. Bulinski
Modifier:J. Sessa Research group:GCP,marine invertebrate
Created:2007-07-20 14:52:36 Last modified:2010-08-10 14:32:47
Access level:the public Released:2007-07-20 14:52:36
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]