IGM-2647, Potrerillos Fm, Mexico - Vega and Perrilliat (1995): Early/Lower Paleocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Carditida
- Carditidae
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Venericardia (Baluchicardia) francescae
Gardner and Bowles 1939
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| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Coahuila |
| Coordinates: | 26.0° North, 100.8° West (view map) | ||
| Paleocoordinates: | 31.7° North, 82.7° West | ||
| Basis of coordinate: | stated in text | ||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Paleocene |
| Stage: | Danian | 10 m.y. bin: | Cenozoic 1 |
| Key time interval: | Early/Lower Paleocene | ||
| Age range of interval: | 66.00000 - 61.60000 m.y. ago |
Stratigraphy
| Geological group: | Difunta | Formation: | Potrerillos | Member: | Upper Mudstone |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The Potrerillos Formation was subdivided into five members by McBride (1974), of which the collection is from the second highest, Upper Mudstone Member. Foraminifera in the lower members indicate a Maastrichtian age, while fossils in the upper members indicate a Paleocene age. IGM 2647 includes mudstones of dark color. | |||||
Lithology and environment
| Primary lithology: | lithified mudstone |
| Includes fossils? | Y |
| Lithology description: Mudstones of dark color. | |
| Environment: | marginal marine indet. |
| Geology comments: Interpreted as tidal flat facies. | |
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 |
| Collection method comments: Studied material is deposited in the Museo de Paleontologia of the Instituto de Geologia, Universidad Nacional Autonoma de Mexico. Types are in the type collection and classified under the acronym IGM. The type locality is registered in the locality catalogue of the Museo de Paleontogia. | |
| Taxonomic list comments:No exhuastive, but including some abundant and biostratigraphically significant taxa. Includes gastropods and bivalves | |
Metadata
| Also known as: | IGM-2647 | ||
| Database number: | 42470 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-07-29 21:42:09 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-07-29 21:42:09 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 11301. | F. J. Vega and M.D.C. Perrilliat. 1995. On some Paleocene invertebrates from the Potrerillos Formation (Difunta Group), northeastern Mexico. Journal of Paleontology 69(5):863-869 [A. Miller/A. Hendy/A. Hendy] |
Secondary references:
| 11300 | F. J. Vega, M.D.C. Perrilliat, and L.M. Mitre-Salazar. 1999. Paleocene ostreids from the Las Encinas Formation (Parras basin, Difunta Group), northeastern Mexico; stratigraphic implications. Geological Society of America Special Paper 340:105-110 [A. Miller/A. Hendy/A. Hendy] |