Late Tertiary equids from the State of Hidalgo, Mexico

Abstract

This paper is a taxonomic revision of the late Tertiary equid species, known so far from the Zacualtipán basin in the State of Hidalgo. The studied material includes the equids from the Tehuichila fauna housed in the Museo de Geología, UNAM, as well as the species Calippus (Grammohippus) castilli and Dinohippus interpolatus, collected (in situ) in the Zietla locality. Based on the presence of these two species, the age of this fossil site is assigned to the early Hemphillian. The mastofauna of Zietla is the only known reference in which a fossil assemblage is reliably tied into the stratigraphical sequence of the Zacualtipán area (from which the Tehuichila fauna is derived)... In order to continue, download full text in PDF.