USGS 13587 - Tamaulipas, Mexico (Guajalote Formation): Early/Lower Miocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Pectinida
- Pectinidae
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Chlamys (Nodipecten) dumblei
Gardner 1945
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| recombined as Lyropecten dumblei | |||||||
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Bivalvia
- Cardiida
- Cardiidae
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Cerastoderma (Dinocardium) ? cabezai
Gardner 1945
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| recombined as Dinocardium cabezai | |||||||
| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Tamaulipas |
| Coordinates: | 24.9° North, 98.2° West (view map) | ||
| Paleocoordinates: | 25.6° North, 94.3° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Early/Lower Miocene | ||
| Age range of interval: | 23.03000 - 15.98000 m.y. ago |
Stratigraphy
| Formation: | Guajalote | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The Guajalote Formation is early Miocene age and can be correlated with the Tuxpam (or Tuxpan) Formations of southern Mexico, and have also been called San Rafael and San Fernandao Formation (Dumble's nomenclature). The Guajalote Formation has similar faunal composition to the Chipola and Shoal River formations of the Alum Bluff Group, Flordia. Field relations indicate that the fossiliferous beds of the Guajalote Formation lie some 2,500 feet above those of the upper Oligocene. | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal lithified sandstone |
| Includes fossils? | Y |
| Lithology description: No specific lithologic description other than "fossiliferous sandstone". | |
| Environment: | coastal indet. |
| Glacial or sequence phase: | regressive |
| Geology comments: Siliciclastic. No paleoenvironmental data reported. The lower Miocene was an interval of regression in the Gulf of Mexico. | |
Taphonomy
| Modes of preservation: | body,mold/impression |
| Size of fossils: | macrofossils |
| Articulated whole bodies: | many |
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 13587 | ||
| Database number: | 43073 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-10 09:23:00 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | group members | Released: | 2005-08-10 09:23:00 |
| 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] |