Mx1: Barranco de la Bolita (Level 9): Bajocian, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Stephanoceratidae
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Duashnoceras paucicostatum
(Felix 1891)
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Bivalvia
- Trigoniida
- Myophorellidae
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Vaugonia sp.
Crickmay 1930
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Bivalvia
- Trigoniida
- Trigoniidae
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Indotrigonia sp.
Dietrich 1933
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| spelled with current rank as Trigonia (Indotrigonia) | |||||||
| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Oaxaca |
| Coordinates: | 16.8° North, 97.0° West (view map) | ||
| Paleocoordinates: | 8.1° North, 47.2° West | ||
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Middle Jurassic |
| Stage: | Bajocian | 10 m.y. bin: | Jurassic 4 |
| *Period: | Middle Jurassic | *Epoch: | Dogger |
| Key time interval: | Bajocian | ||
| Age range of interval: | 170.90000 - 168.20000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
Lithology and environment
| Primary lithology: | concretionary,gray,yellow lithified calcareous "shale" |
| Lithology description: yellowish-gray shale, with scarce calcareous concretions. | |
| Environment: | offshore |
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 8060 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers | Research group: | marine invertebrate |
| Created: | 2000-06-15 14:30:27 | Last modified: | 2000-06-15 17:30:27 |
| Access level: | the public | Released: | 2000-11-20 13:53:36 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 539. | J. Sandoval and G. E. G. Westermann. 1986. The Bajocian (Jurassic) ammonite fauna of Oaxaca, Mexico. Journal of Paleontology 60(6):1220-1271 [J. Alroy/M. Sommers/O. Alfaro] |