The Buda Limestone is a geological formation in the High Plains and Trans-Pecos regions of West Texas[1] and in southern New Mexico,[2] whose strata date back to the Late Cretaceous.

The lowest is 25 feet (7.6 m) of hard microgranular grayish-white limestone that breaks with a conchoidal fracture.

Abundant bivalve fossils are found in the formation east of Big Bend National Park.

[6] Exposures in Hays County, Texas have yielded fossil remains of Pterodactyloidea, Ornithocheiroidea and Ornithocheiridae.

The Buda Limestone is an important petroleum reservoir that has been exploited for decades via conventional vertical drilling.