Ixtapa: Miocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Actinopteri
|
||||||||||
|
Percomorphaceae indet.
|
Cantalice and Ortego 2019 | |||||||||
| Family incertae sedis | ||||||||||
|
Mammalia
- Perissodactyla
- Equidae
|
||||||||||
|
Cormohipparion sp.
Skinner and MacFadden 1977
|
||||||||||
|
= aff. Hippotherium sp.
Kaup 1832
|
Alroy 2002 | |||||||||
|
Mammalia
- Perissodactyla
- Rhinocerotidae
|
||||||||||
|
cf. Teleoceras sp.
Hatcher 1894
|
||||||||||
| see common names | ||||||||||
Geography
| Country: | Mexico | State/province: | Chiapas |
| Coordinates: | 16.8° North, 92.9° West (view map) | ||
| Paleocoordinates: | 17.2° North, 90.3° West | ||
| Basis of coordinate: | based on nearby landmark |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5-6 | ||
| *Period: | Tertiary | ||
| Key time interval: | Miocene | ||
| Age range of interval: | 23.03000 - 5.33300 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
Lithology and environment
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Taxonomic list comments:"Ixtapa" specimens of Gomphotherium are from Rio Salado (see); remaining specimens are from several localities 1.5 to 2.8 km WSW of Ixtapa K-Ar dates for a tuff above the L.F. appear to be unreliable due to "laboratory handling"; according to Ferrusquia 1996, the fossils are from units 10 and 12 in the type section, and the closest dated horizon is unit 17, more than 300 m above, which has been dated at 12.53 +/- 0.20 Ma (K-Ar, biotite), 15.02 +/- 0.35 Ma (K-Ar, biotite), and 16.02 +/- 0.53 (K-Ar, plagioclase); these dates are indeed highly discrepant and too stratigraphically removed to be relevant |
Metadata
| Database number: | 18726 | ||
| Authorizer: | J. Alroy, M. Uhen | Enterer: | J. Alroy, H. Khan | Research group: | vertebrate |
| Created: | 1993-02-18 00:00:00 | Last modified: | 2002-06-03 03:27:43 |
| 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:
| 6294 | J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari] | |
| 83152 | K. M. Cantalice and J. A. Ortego. 2019. The first occurrence of a freshwater percomorph fish (Actinopterygii: Teleostei) in the Ixtapa Formation (Miocene), Chiapas, southeastern Mexico. Bol. Soc. Geol. Mex 71(3):831-839 [M. Uhen/H. Khan] |