Lincoln Creek Formation
| Lincoln Creek Formation | |
|---|---|
| Stratigraphic range: Late Eocene-Early Miocene | |
| Type | Formation |
| Unit of | Belgian Basin |
| Underlies | Astoria Formation |
| Overlies | Skookumchuck Formation, Humptulips Formation |
| Thickness | 3,000 metres (9,800 ft) |
| Lithology | |
| Primary | mudstone, sandstone, siltstone |
| Other | conglomerate, pyroclastic rock |
| Location | |
| Region | Washington |
| Country | United States |
| Type section | |
| Named for | Lincoln Creek (Chehalis River tributary) |
Lincoln Creek Formation (originally known as the Lincoln Formation) is a geologic formation in the state of Washington. It is part of the Belgian Basin and preserves fossils dating to between the Late Eocene-Early Miocene, recording an almost complete sequence between the two. The formation overlies the Skookumchuck and Humptulips Formations and underlies the Astoria Formation. It preserves a marine shelf and slope environment with multiple methane seep communities containing coral, sponges, mollusks, and rare echinoderms.