Ixtapa (Miocene of Mexico)
Where: Chiapas, Mexico (16.8° N, 92.9° W: paleocoordinates 17.2° N, 90.3° W)
• coordinate based on nearby landmark
When: Miocene (23.0 - 5.3 Ma)
Environment/lithology: terrestrial
Primary reference: 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]more details
PaleoDB collection 18726: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Hina Khan
Creative Commons license: CC BY (attribution)
Taxonomic list
• "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
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
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Mammalia | |
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cf. Teleoceras sp. Hatcher 1894 rhinoceros | |
Actinopteri | |
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