Station 49 Alazan-Moyutla Road, Alazan: Early/Lower Oligocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium (Dentalium) alazanum
Cooke 1928
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| new species | ||||||||||
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Dentalium ovale
Cooke 1928
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| new species | ||||||||||
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Bivalvia
- Pectinida
- Pectinidae
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Amussium alazanum
Cooke 1928
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| new species | ||||||||||
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Gastropoda
- Eulimidae
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Protonema bartschi
Cooke 1928
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| new species | ||||||||||
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Gastropoda
- Naticidae
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Natica alazana
Cooke 1928
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| new species | ||||||||||
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Polynices (Lunatia) lacrimans
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| original and current combination Lunatia | ||||||||||
| new species | ||||||||||
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Polynices (Euspira) byramensis
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| original and current combination Polinices | ||||||||||
| new species | ||||||||||
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Gastropoda
- Neogastropoda
- Olividae
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Ancilla (Ancillina) alazana
Cooke 1928
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| new species | ||||||||||
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Gastropoda
- Neogastropoda
- Turridae
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Gemmula alazana
Cooke 1928
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| new species | ||||||||||
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Gemmula mexa
Cooke 1928
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| new species | ||||||||||
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Gastropoda
- Neogastropoda
- Conidae
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Glyptotoma rhombica
Cooke 1928
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| new species | ||||||||||
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Gastropoda
- Neogastropoda
- Borsoniidae
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Borsonia aguilae
Cooke 1928
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| new species | ||||||||||
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Gastropoda
- Ampullinidae
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Ampullina vaughani
Cooke 1928
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| new species | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Mexico |
| Coordinates: | 23.7° North, 102.8° West (view map) |
| Paleocoordinates: | 24.6° North, 96.8° West |
| Basis of coordinate: | based on political unit |
| Geographic resolution: | local area |
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
| Geological group: | Alazan | Formation: | Palma Real | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Underlain by shales and overlain by yellowish clay. Thickness of 70-80 feet are exposed. Lowest part of the formation. Woodring (1966): this is the Palma Real Formation. | |||||
Lithology and environment
| Primary lithology: | blue lithified "shale" |
| Includes fossils? | Y |
| Lithology description: Fossiliferous beds are eroded in places into potholes 8-10m in diameter. In some places fossiliferous beds seem broken and piled together in every direction. | |
| Environment: | marine indet. |
| Geology comments: Shales end abruptly as though faulted. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some genera |
| Reason for describing collection: | general faunal/floral analysis |
| Taxonomic list comments:the species named here include only a small part of the total number of mollusks in the Alaxan clay. | |
Metadata
| Database number: | 61206 | ||
| Authorizer: | A. Miller | Enterer: | K. Bulinski |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2006-05-30 22:11:52 | Last modified: | 2016-03-12 12:12:04 |
| Access level: | the public | Released: | 2006-05-30 22:11:52 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 17583. | C. W. Cooke. 1928. New Vicksburg (Oligocene) Mollusks From Mexico. Proceedings from the United States National Museum 73(10):1-11 [A. Miller/K. Bulinski] |