| Black Peaks Formation | |
|---|---|
| Stratigraphic range: Maastrichtian-Danian (Tiffanian) ~ | |
| Type | Geological formation |
| Unit of | Tornillo Group |
| Overlies | Javelina Formation |
| Lithology | |
| Primary | Mudstone |
| Other | Limestone |
| Location | |
| Coordinates | 29°18′N103°24′W / 29.3°N 103.4°W |
| Approximate paleocoordinates | 36°00′N82°48′W / 36.0°N 82.8°W |
| Region | Texas |
| Country | United States |
  Black Peaks Formation (the United States)  Black Peaks Formation (Texas) | |
The Black Peaks Formation is a geological formation in Texas whose strata date back to the Late Cretaceous. [1] Though some of its strata date back to the Paleocene and Eocene. [2] [3] Dinosaur remains (from the titanosaurian sauropod, either Alamosaurus or Utetitan [4] ) and the pterosaur Quetzalcoatlus northropi [5] have been among the fossils reported from the formation. [6] [7] The boundary with the underlying Javelina Formation has been estimated at 66.5 million years old. [8] The formation preserves the rays Rhombodus and Dasyatis , as well as many gar scales. [9] Cenozoic aged fossils unearthed here consist of mammals like multituberculates, barylambdids, and insectivores, as well as alligatorids like Bottosaurus . [10] [11] Turtle fossils have also been unearthed here too. [12]