Hoko River Formation
The Hoko River Formation is a Late Eocene marine sedimentary geologic formation. The formation is exposed in outcrops along the Strait of Juan de Fuca on the Olympic Peninsula in Washington state, USA. It is known for containing numerous fossils of crabs. It overlies the older Lyre Formation and underlies the younger Makah Formation.
| Hoko River Formation | |
|---|---|
| Stratigraphic range: | |
Branchioplax washingtoniana, Hoko River Formation | |
| Type | Geological formation |
| Unit of | Twin River Group |
| Underlies | Makah Formation sediments |
| Overlies | Lyre Formation sediments |
| Thickness | approximately 2,300 metres (7,550 ft) |
| Lithology | |
| Primary | submarine fan system |
| Location | |
| Region | Clallam County, Olympic Peninsula Washington |
| Country | United States |
| Extent | over 100 kilometres (62 mi) |
| Type section | |
| Named by | Snavely et al, 1978 |
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