Bed 12t: Early Berriasian - Middle Berriasian, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Himalayitidae
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Durangites sp.
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| see common names | |||||||
Geography
| Country: | Mexico | State/province: | San Luis Potosí |
| Coordinates: | 23.6° North, 100.9° West (view map) | ||
| Paleocoordinates: | 19.9° North, 53.3° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| Stage: | Berriasian | 10 m.y. bin: | Cretaceous 1 |
| Key time interval: | Early Berriasian - Middle Berriasian | ||
| Age range of interval: | 145 - 140.6 m.y. ago |
Stratigraphy
| Formation: | La Caja | Member: | El Verde |
| Local section: | Los Alamitos 1 | Local bed: | 12t |
| Local order: | bottom to top |
Lithology and environment
| Primary lithology: | lithified marl |
| Secondary lithology: | ferruginous silty "limestone" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: The Upper most part of the section is characterized by 1.5 to 4.5 meters or marly and silty intercalations with several beds of silty limestones. | |
| Environment: | carbonate indet. |
| Geology comments: None | |
Taphonomy
| Modes of preservation: | body,cast,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils,some microfossils |
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 192480 | ||
| Authorizer: | A. Rojas | Enterer: | A. Rojas |
| Created: | 2018-04-09 10:31:40 | Last modified: | 2018-04-09 10:31:40 |
| Access level: | authorizer only | Released: | 2020-04-09 10:31:40 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 65174. | F. Olóriz, A. B. Villaseñor, C. Gonzalez-Arreola and G. E. G. Westermann. 1999. Ammonite Biostratigraphy and Correlations in the Upper Jurassic-Lowermost Cretaceous La Caja Formation of North-Central Mexico (Sierra de Catorce, San Luis de Potosí). In F. Olóriz, F. J. Rodríguez-Tovar (eds.), Advancing Research on Living and Fossil Cephalopods 550 [A. Rojas/A. Rojas] |