Also known as Arrastracabllos; Gto-4; GTO-5 (Miller Place); GTO-5A; GTO-5B; Gto-6; Gto. 6; GTO-6; GTO-14 (Cuesta Blanca); Gto-18; GTO-31 (Pajaro Grande); GTO-33 (Pork Chop); Gto-45; Tren Plano
Where: Guanajuato, Mexico (21.0° N, 100.8° W: paleocoordinates 21.1° N, 100.2° W)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Rancho Viejo Beds Formation, Blancan (4.9 - 1.8 Ma)
• dated at 3.6 Ma by Kowallis et al. 1986 using FT on zircon; this is the younger of two modes, the other being at 30.7 Ma
•this date is superseded by paleomag and an Ar/Ar date of 3.36 +/- 0.04 Ma reported by Flynn et al. 2005, which show that all of chron C2An.3n and the neighboring reversed chrons are spanned by the lengthy Blancan fossiliferous interval
•overlies Coecillo and Arroyo Tepalcates
• member-level stratigraphic resolution
Environment/lithology: "floodplain"; brown, yellow, silty, sandy claystone and volcaniclastic ash
Size class: macrofossils
Primary reference: W. E. Miller and O. Carranza-Castaneda. 1984. Late Cenozoic Mammals from Central Mexico. Journal of Vertebrate Paleontology 4(2):216-236 [J. Alroy/J. Alroy/J. Ju]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 20077: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot
Creative Commons license: CC BY (attribution)
Taxonomic list
Mammalia | |
"Glyptotherium ? arizonae" = Glyptotherium texanum8
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"Paramylodon garbanii" = Glossotherium garbanii1
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Pewelagus mexicanus1, Aluralagus cf. bensonensis10, Paranotolagus complicatus n. sp., Notolagus velox9
Paranotolagus complicatus n. sp. Miller and Carranza-Castaneda 1982 rabbit see Miller and Carranza 1982
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Paenemarmota sp. Hibbard and Schultz 1948 squirrel omitted from Gto. 6 list of Miller and Carranza 1998a
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"Neochoerus dichroplax" = Phugatherium dichroplax2
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Mustelidae indet. Fischer 1817 mustelid carnivore | |
Ursidae indet. Gray 1825 bear | |
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Nannippus peninsulatus Cope 1885 hipparionine horse | |
Capromeryx tauntonensis7 Morgan and Morgan 1995 pronghorn "Rancho Viejo beds, about 12 km northeast of the city of San Miguel de Allende"
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Megatylopus sp.6, Camelops sp.6, Hemiauchenia blancoensis5, Hemiauchenia gracilis6, Blancocamelus meadei6
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Gomphotheriidae indet. Hay 1922 gomphothere |