| Alkali Canyon Formation | |
|---|---|
| Stratigraphic range: Tortonian-Zanclean (Hemphillian) ~ | |
| Type | Formation |
| Unit of | Dalles Group |
| Lithology | |
| Primary | Sandstone |
| Other | Tuff |
| Location | |
| Coordinates | 45°42′N 120°12′W / 45.7°N 120.2°W |
| Approximate paleocoordinates | 45°36′N 117°30′W / 45.6°N 117.5°W |
| Region | Gilliam & Morrow Counties, Oregon |
| Country |  United States |
| Extent | Eastern Columbia Basin |
| Type section | |
| Named for | Alkali Canyon, 16 km (9.9 mi) SW of Arlington |
| Named by | Farooqui et al. |
| Year defined | 1981 |
  Alkali Canyon Formation (the United States)  Alkali Canyon Formation (Oregon) | |
The Alkali Canyon Formation is a geologic formation in Oregon. It preserves fossils dating back to the Tortonian to Zanclean stages (Hemphillian) of the Neogene period.[1][2]