Buda Limestone
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The Buda Limestone is a geological formation in the High Plains and Trans-Pecos regions of West Texas and in southern New Mexico, whose strata date back to the Late Cretaceous. Pterosaur remains are a
Plate from "Fauna of the Buda Limestone"
Boquillas Formation
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The Boquillas Formation is a geologic formation deposited during the Late Cretaceous in modern-day West Texas. It is typically composed of alternating marls and limestones with thin volcanic ash beds.
Buda Limestone
…Ford Group. The total thickness is about 100 feet (30 m). In trans-Pecos Texas, the formation rests on the Grayson Formation and is overlain by the Boquillas Formation. In the Big Bend National Park area, the formation is divided into three informal members. The lowest is 25 feet (7.6 m) of hard microgranular grayish-white…
Limestone of the Boquillas Formation in Big Bend National Park