It is a terrestrial formation of Aptian age (Lower Cretaceous), and is notable for its dinosaur fossils.

Dinosaurs from this formation include the large theropod Acrocanthosaurus, the sauropod Sauroposeidon, as well as the ornithopods Tenontosaurus and Convolosaurus.

[1] [2] It is the lowermost unit of the lower Cretaceous, lying unconformably on Carboniferous strata.

It is the lateral equivalent of the lower part of the Antlers Formation.

This article about a specific stratigraphic formation in Texas is a stub.