MGS #91a: Rupelian, Mississippi
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Pholadida
- Teredinidae
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Teredo sp.
Linnaeus 1758
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2 individuals | |||||||||
| R category | ||||||||||
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Bivalvia
- Pectinida
- Pectinidae
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Chlamys menthifontis
Glawe 1970
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4 individuals | |||||||||
| R category | ||||||||||
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Pecten poulsoni
Morton 1834
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A category | |||||||||
| 100+ valves collected | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Mississippi | County: | Smith |
| Coordinates: | 32.0° North, 89.5° West (view map) | ||||
| Paleocoordinates: | 32.3° North, 83.0° West | ||||
| Basis of coordinate: | based on political unit | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| *Period: | Early/Lower Tertiary | *Epoch: | Early/Lower Oligocene |
| *International age/stage: | Early/Lower Rupelian - Early/Lower Rupelian | ||
| Key time interval: | Rupelian | ||
| Age range of interval: | 33.9 - 27.82 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Marianna Limestone | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: The Mint Spring Formation - 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 envoronments, 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 off shore carbonate shelf. | |||||
Lithology and environment
| Primary lithology: | lithified conglomeratic,calcareous conglomerate | ||
| Secondary lithology: | "carbonate" | ||
| Includes fossils? | Y | ||
| Includes fossils? | Y | ||
| Environment: | offshore | Tectonic setting: | passive margin |
Taphonomy
| Modes of preservation: | body,original aragonite,original calcite |
| Size of fossils: | mesofossils |
Collection methods and comments
| Collection excludes: | all microfossils,some macrofossils,difficult macrofossils |
| Collection methods: | bulk,mechanical,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: bivalves only. | |
| Taxonomic list comments:the list uses catagories R = rare,1-9 valves collected. C = common, 10-99 valves collected. A = abundant, 100+ valves collected.
Categories are listed in the comments field, absolute abundances are given in the abundance field. Since taxa with greater than 99 specimens were not counted with absolute abundances, these were reported with category "A" for abundant. | |
Metadata
| Database number: | 5951 | ||
| Authorizer: | L. Ivany | Enterer: | S. DeLong |
| Modifier: | J. Sessa | Research group: | GCP,marine invertebrate |
| Created: | 2000-01-04 08:59:33 | Last modified: | 2010-08-06 10:55:52 |
| Access level: | the public | Released: | 2000-01-04 08:59:33 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 323. | 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] |