USGS 13681 - Nuevo Leon, Mexico (Middle Indio Formation): Early/Lower Eocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Cassidae
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Galeodea sp.
Link 1807
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| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Nuevo Leon |
| Coordinates: | 26.1° North, 99.2° West (view map) | ||
| Paleocoordinates: | 29.7° North, 86.0° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Early/Lower Eocene | ||
| Age range of interval: | 56.00000 - 47.80000 m.y. ago |
Stratigraphy
| Geological group: | Wilcox | Formation: | Indio | Member: | Middle |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The Indio Formation of south Texas, characterised by platy or slabby sandstones and thin-bedded sandy shale and clay, is rpesent in Mexico, with an estimated thickness of more than 3000 ft. The Indio Formation shows faunal similarity with the Tuscahoma and Bashi Formations of Alabama. The Indio Formation is subdivided into three members. The collection is derived from the middle member. | |||||
Lithology and environment
| Primary lithology: | lithified sandstone |
| Secondary lithology: | planar lamination sandy "shale" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Platy or slabby sandstones and thin-bedded sandy shale and clay. | |
| Environment: | marine 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 13681 | ||
| Database number: | 42941 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-07 13:20:29 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-08-07 13:20:29 |
| 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] |