MGS #35 Sample 4: Rupelian, Mississippi

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Tritaria falsus
22 individuals
Bivalvia - Nuculida - Nuculidae
Nucula vicksburgensis Conrad 1848
5 individuals
Bivalvia - Nuculanida - Yoldiidae
Yoldia clydoniona Dockery 1982
23 individuals
Bivalvia - Poromyida - Spheniopsidae
Spheniopsis mississippiensis
1 individual
Bivalvia - Poromyida - Verticordiidae
Verticordia dalliana
3 individuals
Haliris quadrangularis
2 individuals
Bivalvia - Pholadida - Corbulidae
Corbula rufaripa
26 individuals
Corbula engonata Conrad 1848
1 individual
Bivalvia - Cardiida - Kelliellidae
Kelliella rufaripa
2 individuals
Bivalvia - Cardiida - Veneridae
Pitar aldrichi
1 individual
Bivalvia - Cardiida - Cardiidae
Nemocardium eocenense (Meyer 1887)
1 individual
Bivalvia - Lucinida - Lucinidae
Myrtaea scopularis
17 individuals
Bivalvia - Carditida - Astartidae
Astarte triangulata Meyer 1886
19 individuals
Bivalvia - Pectinida - Pectinidae
Pecten sp. Müller 1776
1 individual
Chlamys cocoana
2 individuals
Eburneopecten subminutus (Aldrich 1903)
3 individuals
Bivalvia - Arcida - Arcidae
Scapharca invidiosa (Casey 1903)
19 individuals
Scaphopoda - Gadilida - Gadilidae
Cadulus sp. Philippi 1844
50 individuals
Species A (45 Individuals & Species B together (5 individuals)
Scaphopoda - Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758
15 individuals
Gastropoda - Opisthobranchiata - Haminoeidae
Atys caseyi
2 individuals
Gastropoda - Opisthobranchiata - Cylichnidae
Acteocina crassiplica
6 individuals
subspecies altispira
Scaphander primus
2 individuals
Gastropoda - Neotaenioglossa - Calyptraeidae
Calyptraea cf. aperta (Solander 1766)
1 individual
Gastropoda - Naticidae
Natica caseyi
14 individuals
Gastropoda - Neogastropoda - Conidae
Conus protractus
1 individual
Gastropoda - Neogastropoda - Drilliidae
Syntomodrillia collarubra
5 individuals
Gastropoda - Neogastropoda - Turridae
Gemmula amica Casey 1903
6 individuals
Gastropoda - Neogastropoda - Cancellariidae
Olssonella elongata
1 individual
Gastropoda - Vitrinellidae
Vitrinella laevis
1 individual
Gastropoda - Turritellidae
Turritella aff. premimetes
12 individuals
Gastropoda - Heterostropha - Pyramidellidae
Eulimella clearyensis
1 individual
Gastropoda - Heterostropha - Acteonidae
Acteon subaldrichi
1 individual
Gastropoda - Heterostropha - Ringiculidae
Ringicula mississippiensis Conrad 1848
8 individuals
Gastropoda - Heterostropha - Architectonicidae
Architectonica textilina
1 individual
subspecies caseyi
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 4 45cm 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:74080
Authorizer:A. Miller Enterer:K. Bulinski
Modifier:J. Sessa Research group:GCP,marine invertebrate
Created:2007-07-20 14:49:18 Last modified:2010-08-10 14:28:08
Access level:the public Released:2007-07-20 14:49:18
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]