Angular Unconformity, State Bridge, Colorado

ID 2163

This angular unconformity along the Colorado River near State Bridge separates the steeply tilted and deformed Permian (about 250 million year old) redbeds and white sandstones from the gently dipping Miocene (about 23 to 8 million year old) black basaltic lava flows. The angular unconformity represents a surface along which the rock layers were uplifted and eroded during mountain building.

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