Gracias Formation

The Gracias Formation is a geologic formation in Honduras. The mainly sandstones, siltstones and claystones preserve vertebrate fossils dating back to the Neogene period.

Description
The Gracias Formation is a sedimentary unit, consisting of sandstone, siltstone, claystone and a few conglomeratic beds. The formation crops out in western Honduras and ranges from 200 to 300 m in thickness. The formation overlies the Padre Miguel Group, while it is overlain by Pleistocene basalts. The Padre Miguel Group provided the provenance for the sedimentary material for the Gracias Formation. The clasts in the formation are largely composed of rhyolite, rhyodacite, pumice, vitric ash, quartz, feldspar, and minor biotite fragments.

Fossil content

 * Borophagus secundus
 * Calippus hondurensis
 * Cormohipparion ingenuum
 * Procamelus cf. grandis
 * Prosthennops cf. serus
 * Protolabis cf. heterodontus
 * Pseudoceras skinneri
 * Rhynchotherium cf. blicki
 * Teleoceras sp.
 * Rhinocerotidae indet.