Section of Sierra del Alamo, L10: Late Sinemurian, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Cephalopoda
- Ammonitida
- Echioceratidae
|
|||||||
|
Paltechioceras sp.
Buckman 1924
|
|||||||
| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Sonora |
| Coordinates: | 30.6° North, 112.6° West (view map) | ||
| Paleocoordinates: | 13.7° North, 44.6° West (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | local area |
Time
| Period: | Jurassic | Epoch: | Early Jurassic |
| Stage: | Sinemurian | 10 m.y. bin: | Jurassic 1 |
| Key time interval: | Late Sinemurian | Ammonoid zone: | Harbledownense |
| Age range of interval: | 199.5 - 192.9 m.y. ago |
Stratigraphy
| Geological group: | El Antimonio | Formation: | Sierra de Santa Rosa | Member: | Lower Jurassic upper |
| Local section: | Sierra del Alamo | Local bed: | 10 | ||
| Local order: | no particular order | ||||
| Stratigraphy comments: Sequence XIII, informal unit 20 | |||||
Lithology and environment
| Primary lithology: | massive lithified mudstone | ||
| Includes fossils? | Y | ||
| Environment: | deep-water indet. | Tectonic setting: | forearc basin |
Taphonomy
| Modes of preservation: | cast,mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (in situ) |
| Collection size: | 455 specimens |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: Estación Regional del Noroeste (ERNO), Instituto de Geología,Universidad Nacional Autónoma de México collection | |
Metadata
| Database number: | 208248 | ||
| Authorizer: | J. Pálfy | Enterer: | D. Juhász |
| Modifier: | D. Juhász | Research group: | marine invertebrate |
| Created: | 2020-03-25 08:45:52 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | group members | Released: | 2022-03-25 08:45:52 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 71927. | D. Szűcs, C. M. González-León, and J. Pálfy. 2019. Ammonoid biostratigraphy and paleobiogeography of Lower Jurassic sections from Sonora (northwest Mexico) and their tectonic implications. Journal of South American Earth Sciences 93:267-282 [J. Pálfy/D. Juhász/P. Wagner] |