Piedra Lumbre Formation
| Piedra Lumbre Formation | |
|---|---|
| Stratigraphic range: | |
Outcrop of Piedra Lumbre Formation along highway from Dixon to Picuris Pueblo, New Mexico, USA | |
| Type | Formation |
| Unit of | Trampas Group |
| Underlies | Marquenas Formation |
| Overlies | Pilar Formation |
| Thickness | 300 m (980 ft) |
| Lithology | |
| Primary | Schist |
| Other | Quartzite |
| Location | |
| Coordinates | 36°12′32″N 105°49′33″W / 36.2088292°N 105.8257916°W |
| Region | Picuris Mountains, New Mexico |
| Country | United States |
| Type section | |
| Named for | Canada de Piedra Lumbre |
| Named by | Long |
| Year defined | 1976 |
The Piedra Lumbre Formation is a geologic formation that crops out in the Picuris Mountains of northern New Mexico. Detrital zircon geochronology yields a maximum age of 1475 million years, corresponding to the Calymmian period.