USGS 13506 - Tamaulipas, Mexico (Jackson Formation): Late/Upper Eocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Neogastropoda
- Conidae
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Conus (Leptoconus) tortilus
Conrad 1854
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| synonym of Conus sauridens | |||||||
| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Tamaulipas |
| Coordinates: | 26.3° North, 98.8° West (view map) | ||
| Paleocoordinates: | 27.4° North, 91.5° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
| Key time interval: | Late/Upper Eocene | ||
| Age range of interval: | 37.71000 - 33.90000 m.y. ago |
Stratigraphy
| Formation: | Jackson | Member: | Middle | ||
| Local section: | Ciudad | ||||
| Regional section: | Tamaulipas | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The Jackson Group of Mexico and the Gulf Coastal Plain is here considered as a formation. The Jackson Formation can be subdivided into three members, the basal "Roma Sandstone" and middle and upper members (no lithostratigraphic name). No comments are made on relations to Gulf Coastal Plain units, but the enterer considers that the Jackson Formation of this collection is equivalent in age (late Eocene) as the Jackson Group (Gulf Coastal Plain). Collection is from a 10-15 ft lens of fine-grained sandstone or limestone, overlain and underlain by gypsiferous clays and sandy clays. | |||||
Lithology and environment
| Primary lithology: | fine calcareous sandstone |
| Secondary lithology: | fine sandy "limestone" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Fine-grained calcareous sandstone or sandy limestone. | |
| Environment: | coastal indet. |
| Geology comments: Siliciclastic. Enterer considers the fauna to be an inner shelf assemblage. 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 13506 | ||
| Database number: | 43058 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-09 20:21:27 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-08-09 20:21:27 |
| 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] |