| Rincon Valley Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Formation |
| Unit of | Santa Fe Group (geology) |
| Underlies | Camp Rice Formation |
| Overlies | Hayner Ranch Formation |
| Thickness | 610 meters (2,000 ft) |
| Lithology | |
| Primary | Sandstone, mudstone, conglomerate |
| Other | Gypsum |
| Location | |
| Coordinates | 32°35′19″N 106°58′02″W / 32.588750°N 106.967225°W |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named for | Rincon Valley |
| Named by | Seager et al. |
| Year defined | 1971 |
  Rincon Valley Formation (the United States)  Rincon Valley Formation (New Mexico) | |
The Rincon Valley Formation is a geologic formation found in the Rincon Valley of New Mexico. It preserves fossils dating back to the Miocene epoch[1] and records a time when the valley was a closed basin, just before being integrated into the ancestral Rio Grande River.[2]