Suchilquitongo: Early/Lower Hemingfordian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Perissodactyla - Equidae
Merychippus sp. Leidy 1856
    = Equinae indet. Steinmann and Döderlein 1890
Alroy 2002
Mammalia - Perissodactyla - Rhinocerotidae
Rhinocerotidae indet. Gray 1821
Mammalia - Merycoidodontidae
Merychyus aff. minimus Peterson 1907
see also Kelly and Lander 1988
Mammalia - Protoceratidae
Synthetoceras sp. Stirton 1932
Jimenez-Hidalgo 1998
new material
cf. Paratoceras sp. Frick 1937
see common names

Geography
Country:Mexico State/province:Oaxaca
Coordinates: 17.1° North, 96.7° West (view map)
Paleocoordinates:17.7° North, 93.4° West
Basis of coordinate:based on nearby landmark
Time
Period:Neogene Epoch:Miocene
Stage:Burdigalian 10 m.y. bin:Cenozoic 5
*Period:Tertiary
Key time interval:Early/Lower Hemingfordian
Age range of interval:20.43000 - 15.97000 m.y. ago
Age estimate:maximum 19.3 ± 0.3 Ma (K-Ar)
* legacy (obsolete) database fields
Stratigraphy
Formation:Suchilquitongo
Stratigraphy comments: Early Hemingfordian after Ferrusquía-Villafranca 2003
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Taxonomic list comments:dates of "16.5 +/- 0.3 to 17.4 +/- 0.3 Ma" do not apply to the fossiliferous unit; "correct" dates are "19.3 Ma (from feldspars) and 20.6 Ma (from biotite)"; 16.5 date is apparently the same as 16.3 +/- 0.3 Ma for upper part of the formation given by Ferrusquia 1984
apparently the same as the Valle de Oaxaca fauna of Ferrusquia 1978 and Ferrusquia 1984, which came from four "closely spaced" localities
my best guess is that these localities are near the main road around Oaxaca de Juarez
gomphothere Ferrusquia 1984 omitted, perhaps a misidentification
archaeolagine of Ferrusquia 1984 omitted
Metadata
Database number:18744
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Marcot Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2023-10-12 14:01:26
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]
2031 E. Jimenez-Hidalgo. 1998. First record of Synthetoceras (Tylopoda, Protoceratidae) from Oaxaca, southeastern Mexico. Journal of Vertebrate Paleontology 18(3):54A [J. Alroy/J. Alroy/J. Ju]