Big Rock Formation
| Big Rock Formation | |
|---|---|
| Stratigraphic range: | |
Exposure of Big Rock Formation at Mesa la Jara, New Mexico | |
| Type | Formation |
| Unit of | Vadito Group |
| Underlies | Burned Mountain Formation |
| Overlies | Lower Vadito Group |
| Thickness | 70 m (230 ft) |
| Lithology | |
| Primary | Metaconglomerate |
| Other | Quartzite |
| Location | |
| Coordinates | 36°32′59″N 106°05′15″W / 36.5496°N 106.08744°W |
| Region | Tusas Mountains, New Mexico |
| Country | United States |
| Type section | |
| Named for | Big Rock (36°33′29″N 106°04′16″W / 36.558°N 106.071°W) |
| Named by | F. Barker |
| Year defined | 1958 |
The Big Rock Formation is a formation that crops out in the Tusas Mountains of northern New Mexico. Detrital zircon geochronology gives a maximum age for the formation of 1665 Mya, corresponding to the Statherian period.