The Gracias Formation is a geologic formation in Honduras. The mainly sandstones, siltstones and claystones preserve vertebrate fossils dating back to the Neogene period.Gracias Formation at Fossilworks.org
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 in thickness. The formation overlies the Padre Miguel Group, while it is overlain by Pleistocene basalts.N.N., s.a., Informe de Apoyo, A-9 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.Sánchez Barreda, 1999, p.25
Fossil content
Borophagus secundus Calippus hondurensisHulbert, 1988, p.272 Cormohipparion ingenuum Procamelus cf. grandis Prosthennops cf. serus Protolabis cf. heterodontus Pseudoceras skinneri Rhynchotherium cf. blicki Teleoceras sp. Rhinocerotidae indet.
See also
List of fossiliferous stratigraphic units in Honduras
References
Bibliography
Further reading E. C. Olson and P. O. McGrew. 1941. Mammalian fauna from the Pliocene of Honduras. Bulletin of the Geological Society of America 52:1219-1244 S. D. Webb and S. C. Perrigo. 1984. Late Cenozoic Vertebrates from Honduras and El Salvador. Journal of Vertebrate Paleontology 4(2):237-254