MGS Loc. 74b - Chickasawhay River [Mint Spring Fm]: Rupelian, Mississippi
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Pholadida
- Pholadidae
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Jouannetia triquetra
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A category | |||||||||
| 100+ valves collected | ||||||||||
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Bivalvia
- Cardiida
- Veneridae
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Chione craspedonta
|
1 individual | |||||||||
| R category | ||||||||||
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Bivalvia
- Cardiida
- Chamidae
|
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Chama mississippiensis
Conrad 1848
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1 individual | |||||||||
| R category | ||||||||||
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Bivalvia
- Carditida
- Crassatellidae
|
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Crassatella lirasculpta n. sp.
Dockery 1982
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11 category | |||||||||
| C category | ||||||||||
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Bivalvia
- Ostreida
- Ostreidae
|
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Lopha vicksburgensis
(Conrad 1848)
|
4 individuals | |||||||||
| R category | ||||||||||
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Ostrea paroxis
Lesueur 1829
|
40 category | |||||||||
| C category | ||||||||||
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Bivalvia
- Ostreida
- Pteriidae
|
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Pteria argentea
(Conrad 1848)
|
1 individual | |||||||||
| R category | ||||||||||
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Bivalvia
- Pectinida
- Pectinidae
|
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Pecten poulsoni
Morton 1834
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34 category | |||||||||
| C category | ||||||||||
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Bivalvia
- Pectinida
- Spondylidae
|
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Spondylus filiaris
Dall 1916
|
2 individuals | |||||||||
| R category | ||||||||||
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unclassified
|
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Amonia microstriata n. sp.
|
1 individual | |||||||||
| R category | ||||||||||
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Bivalvia
- Arcida
- Glycymerididae
|
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Glycymeris suwannensis
Mansfield 1937
|
1 individual | |||||||||
| R category | ||||||||||
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Glycymeris intercostata
(Gabb 1860)
|
1 individual | |||||||||
| R category | ||||||||||
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Scaphopoda
- Dentaliida
- Dentaliidae
|
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Dentalium varicostata n. sp.
|
MacNeil and Dockery 1984 | |||||||||
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Gastropoda
- Turritellidae
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Turritella boycensis n. sp.
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MacNeil and Dockery 1984 | |||||||||
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Gastropoda
- Vermetidae
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Serpulorbis sp.
Sasso 1827
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MacNeil and Dockery 1984 | |||||||||
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Gastropoda
- Ranellidae
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Sassia conradiana
|
MacNeil and Dockery 1984 | |||||||||
| Sassia conradiana menthafons | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Mississippi | County: | Wayne |
| Coordinates: | 31.0° North, 88.7° West (view map) | ||||
| Paleocoordinates: | 31.3° North, 82.3° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| 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: | Mint Spring | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: The Mint Spring formation consists of fossiliferous sands that lie disconformably above the estuarine clays and sands of the Forest Hill Formation. This contact is characterized by shell gravels that are largely comprised of the bivalve Callista,by lithified clay clasts bored by the bivalve Jouannetia , and by shark and ray teeth. Lithified clay clasts are especially common at the base of the Mint Spring Formationalong the Chicasawhay River in Wayne county. Here clay clasts are numerous enough to have produced a cobble bottom on the Mint Spring sea floor. These clasts formed a hard substrate utilized by a variety of encrusting organisms. The sands of the Mint Spring Formation are moderately clean and often show cross-bedding. These sands indicate a near-shore shelf enviromentand have macrofauna dominated by bivalves. This marine sand facies has well-preserved fossils at the type locality at the Mint Spring Bayou, at localities 99-101 in Rankin County, and at localities 89-90 in Smith County. In Wayne County, at localities 74b, 75b, and 117b, the Mint Spring Formation is only one to two feet in thickness,is very calcareous, and slightly indurated. | |||||
Lithology and environment
| Primary lithology: | lithified sandy,calcareous claystone | ||
| Secondary lithology: | conglomerate | ||
| 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:abundances denoted by catagories. R=rare, 1-09 specimens found. C= common, 10-99 specimens found. A= Abundant, 100+ specimens found. 1 specimen = 1 valve. 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: | 5820 | ||
| Authorizer: | L. Ivany | Enterer: | S. DeLong |
| Modifier: | A. Hendy | Research group: | GCP,marine invertebrate |
| Created: | 1999-12-07 11:21:11 | Last modified: | 2014-08-21 11:50:20 |
| Access level: | the public | Released: | 1999-12-07 11:21:11 |
| 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] |
Secondary references:
| 447 | F. S. MacNeil and D. T. Dockery. 1984. Lower Oligocene Gastropoda, Scaphopoda, and Cephalopoda of the Vicksburg Group in Mississippi. Mississippi Department of Natural Resources, Bureau of Geology Bulletin 124:1-415 [L. Ivany/E. Kowalski/P. Wagner] |