Black Peaks Formation

The Black Peaks Formation is a geological formation in Texas whose strata date back to the Late Cretaceous. Dinosaur remains (from the sauropod Alamosaurus) and the pterosaur Quetzalcoatlus northropi have been among the fossils reported from the formation. The boundary with the underlying Javelina Formation has been estimated at 66.5 million years old. The formation preserves the rays Rhombodus and Dasyatis, as well as many gar scales.