| Rubio Peak Formation | |
|---|---|
| Stratigraphic range: | |
 Monument Peak, located near Lake Valley, New Mexico, USA, is underlain by Rubio Peak Formation. | |
| Type | Formation |
| Unit of | Spears Group |
| Underlies | Sugarlump Tuff |
| Overlies | early Tertiary plutons |
| Thickness | 5,000 feet (1,500 m) |
| Location | |
| Coordinates | 32°41′24″N 107°53′40″W / 32.6899504°N 107.8944869°W |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named by | W.E. Elston |
| Year defined | 1953 |
  Rubio Peak Formation (the United States)  Rubio Peak Formation (New Mexico) | |
The Rubio Peak Formation is a geologic formation located in southwestern New Mexico.[1] It is thought to have been deposited in the Eocene Epoch.[2]