The oldest geological formation in Oregon is in the southeastern corner of Crook County, near its boundary with Grant County. This formation is an outcropping of Devonian limestone created from a larger reef when most of Oregon was covered by water.
The oldest geological formation in Oregon is in the southeastern corner of Crook County near its boundary with Grant County. This formation is an outcropping of Devonian limestone created from a larger reef when most of Oregon was covered by water