Unconformities

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Angular unconformity: Cambrian rock overlying tilted Precambrian sedimentary rock in the Grand Canyon, Arizona.Angular unconformity: Cambrian rock overlying tilted Precambrian sedimentary rock in the Grand Canyon, Arizona.

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Great unconformity on the west side of the Teton Range, WyomingThe yellow arrow points to the contact between the Cambrian Sandstone and underlying Precambrian metamorphic rock... the Great unconformity.

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Great unconformity in SW Montana.Photo of Cambrian Flathead Sandstone overlying Proterozoic gneiss in SW Montana.

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Angular unconformity at Ryan MesaAngular unconformity at Ryan Mesa: 4 Ma basalt flows overlying faulted Artist Drive (left) and Furnace Creek (right) formations. (ID: 140426-51)

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Angular unconformity and channel deposit, central Utah.Angular unconformity and channel deposit, central Utah.

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Angular unconformity and channel deposit, central Utah.Angular unconformity and channel deposit, central Utah. Henry Mtns in background.

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Angular unconformity,central Utah.Angular unconformity central Utah.

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Angular unconformityAngular unconformity between tilted Precambrian meta-sedimentary rock (marble) and Late Cenozoic conglomerate (a mudflow deposit). Photo is about 2m across.

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Nonconformity, ColoradoNonconformity (a type of unconformity) between Cambrian Sandstone and underlying Precambrian metamorphic rock, Glenwood Canyon, Colorado. This unconformity is frequently referred to as the "Great Unconformity"

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Great Unconformity, Colorado.Great Unconformity, between Cambrian Sandstone and Precambrian basement rock along the Eagle River, Colorado. Note old mine workings.

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