The Juchipila Formation is a geologic formation in Mexico. It preserves fossils dating back to the Neogene period.<ref name="carranzacastanedaetal2013"/O. Carranza-Castaneda, J. J. Aranda-Gómez, X. Wang and A. Iriondo. 2013. The Early-Late Hemphillian (Hh2) Faunal Assemblage From Juchipila Basin, State of Zacatecas, Mexico, and Its Biochronologic Correlation with Other Hemphillian Faunas in Central Mexico. Contributions to Science, Natural History Museum of Los Angeles County 521:13-49 Closely corresponding to the other Hemphillian faunal assemblages of North America, it is significant for understanding the palaeofauna of Miocene and Pliocene central Mexico.

Paleoenvironment The paleoenvironment of the Juchipila Formation was largely terrestrial in nature. The El Mixton locality consists of a shallow lacustrine succession, beginning near the bottom of an arroyo. Ostracods and gastropods are abundant in these deposits. A thin bed of unconsolidated white ash-fall material, consisting of felsic glass shards and small, overlies the shallow lacustrine succession of the El Mixton locality. In this part of the succession, camelid and proboscidian footprints are known. The loose paleosols of the El Mixton contain mammal fossils, including the canid Borophagus and the equid Dinohippus. The terrestrial Puente de Cofradía locality bears fossils of Calippus and Cosoryx. The volcaniclastic sandstone of the El Resbalón bears indeterminate megalonychids and antilocaprids.

Paleobiota The Juchipila Formation has yielded a rich variety of extinct mammals.

Mammals GenusSpeciesNotesImagesAlforjas<ref name="fossilworksc"/Fossilworks: El Resbalón. Fossilworks.org. Retrieved 2021-03-31.A. tayloriA camelidAstrohippusA. ansaeAntilocapridae indet.Genus and species indeterminate.A pronghorn.BorophagusB. secundusOriginally Osteoborus secundusCalippusC. hondurensisOriginally Calippus (Grammohippus) hondurensiscf. Cosoryx sp.<ref name="fossilworksb"/Fossilworks: Puente de Cofradía. Fossilworks.org. Retrieved 2021-03-31.Species indeterminateAn antilocapridDinohippusD. mexicanusMachairodontinae indet.Genus and species indeterminateMegalonychidae indet.Genus and species indeterminateNeohipparionN. eurystyleRhinocerotidae indet.Genus and species indeterminatePlioceros sp.<ref name="fossilworksa"/Fossilworks: El Mixtón. Fossilworks.org. Retrieved 2021-03-31.Species indeterminateAn antilocapridTayassuidae indet.Genus and species indeterminateA peccary.

See also

List of fossiliferous stratigraphic units in Mexico

References

External links