Angular Unconformity

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Presentation Description

Check out this interesting unconformity located about 10 minutes south of Helena, MT.

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There is an “ angular unconformity ” exposed in this road-cut 1 mile south of Montana City.

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A B Which side is older? A or B

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A First, the layers on side A were laid down; deposited in a basin such as the floor of an ocean.

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Next, the layers were uplifted, tilted, and eroded. A

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Next, the layers in sequence B were deposited. A

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The uneven surface between sequence A and B is an “ angular unconformity ” . A B

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A B B A Next, the area was REALLY deformed!

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B A

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To learn much more about Montana ’ s interesting geology, go to . . . www.formontana.net/ Press your “ escape key ” to close the presentation.

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