// Workers AI · dad joke modeWhat did the Camas Valley Formation say? "I'm a layered personality.
 | This article relies on a single source. (May 2026) |
| Camas Valley Formation | |
|---|---|
| Stratigraphic range: Early Eocene (Paleogene) | |
| Type | Formation |
| Unit of | Umpqua Group |
| Underlies | Tyee Formation |
| Overlies | Umpqua Group strata |
| Thickness | over 1,500 ft (460 m) |
| Lithology | |
| Primary | Mudstone, siltstone |
| Other | Sandstone (minor) |
| Location | |
| Coordinates | 43°18′36″N 123°04′48″W / 43.3099°N 123.0800°W |
| Region | Douglas County, Oregon |
| Country | United States |
| Extent | Southern Oregon Coast Range |
| Type section | |
| Named for | Camas Valley |
The Camas Valley Formation is an early Eocene marine unit within the southern Tyee Basin composed predominantly of dark-gray mudstone and siltstone with minor sandstone interbeds. The formation was deposited during a marine transgression in relatively low-energy conditions and locally contains calcareous concretions and fossiliferous beds. It conformably overlies older Umpqua Group strata and is overlain by the Tyee Formation. The unit is regionally extensive in the southern Oregon Coast Range and commonly reaches thicknesses of more than 1,500 feet.[1]
See also
[edit]References
[edit]- ↑ Ryu, In-Chang; Niem, Alan R.; Niem, Wendy A. (1996). Oil and gas potential of the southern Tyee basin, southern Oregon Coast Range (PDF) (Report). Oil and Gas Investigations. Portland, Oregon: Oregon Department of Geology and Mineral Industries. Archived from the original (PDF) on 2024-07-07.
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