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 | |
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Stratigraphic range: Miocene-Late Pliocene | |
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 | United States |
Extent | eastern Oregon |
Type section | |
Named for | Rattlesnake Creek |
Named by | J. C. Merriam |
Year defined | 1901[1] |
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