Black Peaks Formation
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| 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′N 103°24′W / 29.3°N 103.4°W |
| Approximate paleocoordinates | 36°00′N 82°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 a titanosaurian sauropod, either Alamosaurus or Utetitan,[4] and a tyrannosaurid[5]) and the pterosaur Quetzalcoatlus northropi[6] are among the fossils reported from the formation.[7][8] The boundary with the underlying Javelina Formation has been estimated at 66.5 million years old.[9] The formation preserves the rays Rhombodus and Dasyatis, as well as many gar scales.[10] Cenozoic aged fossils unearthed here consist of mammals like multituberculates, barylambdids, and insectivores, as well as alligatorids like Bottosaurus.[11][12] Turtle fossils have also been unearthed here too.[13]