| Javelina Formation | |
|---|---|
| Stratigraphic range: Maastrichtian, | |
 Distinctive mauve and red beds of the Javelina Formation outcropping in Big Bend National Park, Texas | |
| Type | Geological formation |
| Unit of | Tornillo Group |
| Underlies | Black Peaks Formation |
| Overlies | Aguja Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Claystone, mudstone, siltstone, conglomerate |
| 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 |  USA |
| Type section | |
| Named for | Javelina |
  Javelina Formation (the United States)  Javelina Formation (Texas) | |
The Javelina Formation is a geological formation in Texas. Dating has shown that the strata date to the Maastrichtian stage of the Late Cretaceous, approximately 70 to 66.5 million years old.[1] The middle part of the formation has been dated to about 69 million years ago plus or minus 1 million years and the top situated near the Cretaceous–Paleogene boundary (in the overlying Black Peaks Formation[1]), dated to 66 Ma ago.[2] Dinosaur remains are among the fossils that have been recovered from the formation.[3]
- ^ a b Woodward, H. N. (2005). Bone histology of the sauropod dinosaur Alamosaurus sanjuanensis from the Javelina Formation, Big Bend National Park, Texas.
- ^ Lehman, T.M.; McDowell, F.; Connelly, J. (2006). "First isotopic (U-Pb) age for the Late Cretaceous Alamosaurus vertebrate fauna of West Texas, and its significance as a link between two faunal provinces". Journal of Vertebrate Paleontology. 26 (4): 922–928. doi:10.1671/0272-4634(2006)26[922:fiuaft]2.0.co;2. S2CID 130280606.
- ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. ISBN 0-520-24209-2.