![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Rattlesnake_Formation_near_Picture_Gorge.jpg/640px-Rattlesnake_Formation_near_Picture_Gorge.jpg&w=640&q=50)
Rattlesnake Formation
Geologic formation in Oregon, United States / From Wikipedia, the free encyclopedia
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The Rattlesnake Formation is a Miocene to late Pliocene geologic formation found along the John Day River Valley of Oregon, in the Western United States.
Quick Facts Type, Overlies ...
Rattlesnake Formation | |
---|---|
Stratigraphic range: Miocene-Late Pliocene | |
![]() The caprock in this photo (near Picture Gorge) is the ignimbrite layer | |
Type | Sedimentary and igneous |
Overlies | Mascall Formation, Columbia River Basalt Group |
Area | John Day Valley |
Thickness | 700 feet (210 m) |
Lithology | |
Primary | Fanglomerate, siltstone |
Other | Tuff (ignimbrite) |
Location | |
Coordinates | 44.5°N 119.6°W / 44.5; -119.6 |
Approximate paleocoordinates | 44.5°N 116.9°W / 44.5; -116.9 |
Region | Oregon |
Country | ![]() |
Extent | eastern Oregon |
Type section | |
Named for | Rattlesnake Creek |
Named by | J. C. Merriam |
Year defined | 1901[1] |
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