IGM-2647, Adjuntas Fm, Mexico - Perrilliat and Vega (1994): Ypresian, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Bivalvia
- Ostreida
- Ostreidae
|
|||||||
| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Nuevo Leon |
| Coordinates: | 26.0° North, 100.9° West (view map) | ||
| Paleocoordinates: | 32.6° North, 79.4° West (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Ypresian | ||
| Age range of interval: | 56 - 48.07 m.y. ago |
Stratigraphy
| Geological group: | Difunta | Formation: | Adjuntas | ||
| Local section: | IGM-2647 | ||||
| Regional section: | Delgado | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Fossils from well-defined stratum 2 m thick. The Adjuntas is the youngest and one of the most fossiliferous formations of the Difunta Group. Previously considered to be Maastrichtian in age, but subsequent work has place the unit in the Ypresian stage. The Adjuntas Formation has its most extensive outcrop areas in the synclines of the La Popa Basin. | |||||
Lithology and environment
| Primary lithology: | coarse,brown sandstone |
| Includes fossils? | Y |
| Lithology description: Coarse sandstone matrix of brown color. | |
| Environment: | estuary/bay |
| Geology comments: Deltaic plain deposits, probably estuary near distributary channels. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Disassociated major elements: | many |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Collections reposited at IGM (Mexico). | |
| Taxonomic list comments:Largely monospecific assemblages. | |
Metadata
| Also known as: | IGM-2647 | ||
| Database number: | 41753 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-07-20 11:48:20 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2004-07-20 11:48:20 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 11172. | M.D.C. Perrilliat and F.J. Vega. 1994. Early Eocene Ostreids from the Adjuntas Formation, Difunta Group, northeastern Mexico. Tulane Studies in Geology and Paleontology 26:15--25 [A. Miller/A. Hendy/A. Hendy] |