El Gramal: Barstovian, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
- Perissodactyla
- Equidae
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Merychippus sp.
Leidy 1856
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"sensu lato" | ||||||||||
Mammalia
- Camelidae
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Camelidae indet.
Gray 1821
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Mammalia
- Protoceratidae
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? Protoceratidae indet.
Marsh 1891
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Mammalia
- Proboscidea
- Gomphotheriidae
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Gomphotherium sp.
Burmeister 1837
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see common names |
Geography
Country: | Mexico | State/province: | Oaxaca |
Coordinates: | 16.6° North, 96.1° West (view map) | ||
Paleocoordinates: | 17.1° North, 93.3° West | ||
Basis of coordinate: | estimated from map | ||
Geographic resolution: | outcrop |
Time
Period: | Neogene | Epoch: | Miocene |
10 m.y. bin: | Cenozoic 5 | ||
*Period: | Tertiary | ||
Key time interval: | Barstovian | ||
Age range of interval: | 15.97000 - 13.60000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | El Camarón | ||||
Stratigraphic resolution: | member | ||||
Stratigraphy comments: formation "is estimated between 200 and 250 m... The fossil mammals occurred in the lower member (usually the lower part), and were collected at several sites [seven shown on map]... from a zone ~30 m thick at the most"; it intertongues with the Yautepec Tuff, dated at 15.0 +/- 0.8 to 16.7+/- 0.71 by K-Ar (Bravo-Cuevas and Ferrusquía-Villafranca 2006) |
Lithology and environment
Primary lithology: | tuffaceous poorly lithified siltstone |
Secondary lithology: | tuffaceous poorly lithified sandstone |
Lithology description: formation is "Friable to moderately indurated tuffaceous siltstone, sandstone and conglomerate; lower part [yielding the fossils] is finer grained and thinly bedded" (Bravo-Cuevas and Ferrusquía-Villafranca 2006) | |
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | field collection |
Reason for describing collection: | general faunal/floral analysis |
Taxonomic list comments:overlies tuff dated by K-Ar at 14.96 +/- 0.85 Ma |
Metadata
Also known as: | Nejapa | ||
Database number: | 18724 | ||
Authorizer: | J. Alroy | Enterer: | J. Alroy |
Modifier: | J. Alroy | Research group: | vertebrate |
Created: | 1993-02-18 00:00:00 | Last modified: | 2007-01-14 17:11:10 |
Access level: | the public | Released: | 1993-02-18 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
1483. | I. Ferrusquia-Villafranca. 1990. Biostratigraphy of the Mexican Continental Miocene: Part I, Introduction and the Northwestern and Central Faunas. Part II, The Southeastern (Oaxacan) Faunas. Part III, The Southeasternmost (Chiapasan) Fauna and Concluding Remarks On the Discussed Vertebrate Record. Paleontologia Mexicana 56:1-149 [J. Alroy/J. Alroy/J. Marcot] |
Secondary references:
19645 | V. M. Bravo-Cuevas and I. Ferrusquía-Villafranca. 2006. Merychippus (Mammalia, Perissodactyla, Equidae) from the Middle Miocene of state of Oaxaca, southeastern Mexico. Géobios 39:771-784 [J. Alroy/J. Alroy] |