Suchilquitongo (Miocene of Mexico)

Where: Oaxaca, Mexico (17.1° N, 96.7° W: paleocoordinates 17.6° N, 94.1° W)

• coordinate based on nearby landmark

When: Suchilquitongo Formation, 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 18744: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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
Mammalia
 Perissodactyla - Rhinocerotidae
Rhinocerotidae indet. Gray 1821 rhinoceros
 Perissodactyla - Equidae
Equinae indet.1 Steinmann and Döderlein 1890 horse
 Ungulata - Merycoidodontidae
Merychyus aff. minimus Peterson 1907 oreodont
see also Kelly and Lander 1988
 Ungulata - Protoceratidae
cf. Paratoceras sp. Frick 1937 protoceratid
Synthetoceras sp.2 Stirton 1932 protoceratid
new material