Alazán Sample 49B: Early/Lower Oligocene, Mexico
collected by J. Álvarez
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Ostracoda
- Podocopida
- Pontocyprididae
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Argilloecia hiwanneensis
Howe and Law 1936
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Ostracoda
- Podocopida
- Loxoconchidae
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Loxoconcha aff. woodwardsensis
Howe and Law 1936
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Ostracoda
- Podocopida
- Xestoleberididae
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Xestoleberis vicksburgensis
Howe and Law 1936
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Ostracoda
- Podocopida
- Cytheruridae
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Cytheropteron mexicanum
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Ostracoda
- Podocopida
- Trachyleberididae
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Brachycythere sp.
Alexander 1933
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Ambocythere aff. elongata
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Ambocythere subreticulata
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Trachyleberidea blanpiedi
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| aff. var. melvinensis | ||||||||||
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Ostracoda
- Platycopida
- Cytherellidae
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Cytherella hannai
Howe and Law 1936
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| see common names | ||||||||||
Geography
| Country: | Mexico | State/province: | Veracruz |
| Coordinates: | 21.2° North, 97.7° West (view map) | ||
| Paleocoordinates: | 21.9° North, 91.9° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | small collection |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Rupelian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Early/Lower Oligocene | ||
| Age range of interval: | 33.90000 - 27.82000 m.y. ago |
Stratigraphy
| Formation: | Alazán | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: the ostracods "show a distinct affinity to those present in the Red Bluff Formation, basal Oligocene of Mississippi" | |||||
Lithology and environment
| Primary lithology: | not reported |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | microfossils |
Collection methods and comments
| Collection methods: | survey of museum collection |
| Reason for describing collection: | general faunal/floral analysis |
| Collectors: | J. Álvarez |
| Collection method comments: Lousiana State University collection | |
Metadata
| Database number: | 94169 | ||
| Authorizer: | J. Alroy | Enterer: | J. Alroy | Research group: | micropaleontology |
| Created: | 2010-02-10 11:39:35 | Last modified: | 2010-02-10 13:39:35 |
| Access level: | the public | Released: | 2010-02-10 11:39:35 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 32000. | L. A. Laurencich. 1969. Some Ostracoda from the Alazán Formation, Mexico. Micropaleontology 15(4):493-503 [J. Alroy/J. Alroy] |