USGS 13486 - Nuevo Leon, Mexico (Midway Formation): Late/Upper Paleocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea ? eothirsae
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Gastropoda
- Turritellidae
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Mesalia sayi
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| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Nuevo Leon |
| Coordinates: | 25.7° North, 99.2° West (view map) | ||
| Paleocoordinates: | 30.1° North, 84.0° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Paleocene |
| Stage: | Thanetian | 10 m.y. bin: | Cenozoic 1 |
| Key time interval: | Late/Upper Paleocene | ||
| Age range of interval: | 59.20000 - 56.00000 m.y. ago |
Stratigraphy
| Formation: | Midway | Member: | Upper | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The Midway Formation of northeastern Mexico is divided into upper and lower divisions (members). The lower member roughly correlates to the Wills Point, Naheola, and Porters Creek Formations of the Gulf Coastal Plain. Collections show little faunal similarity to any Gulf Coast units. | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal,gray lithified argillaceous,calcareous sandstone |
| Includes fossils? | Y |
| Lithology description: Fine, pearly-gray calcareous and argillaceous sandstones veined with black calcite and is highly fossiliferous. | |
| Environment: | coastal indet. |
| Geology comments: Siliciclastic. No paleoenvironmental data reported. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM |
| Collection method comments: Collections reposited in USGS and USNM collections. | |
| Taxonomic list comments:Exhaustive for mollusca. | |
Metadata
| Also known as: | USGS 13486 | ||
| Database number: | 42925 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-07 04:35:44 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-08-07 04:35:44 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 7474. | J. Gardner. 1945. Mollusca of the Tertiary formations of Northeastern Mexico. Geological Society of American Memoir 11 [M. Kosnik/M. Kosnik/M. Kosnik] |