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USGS Geology in the Parks

Seastack, Central California
Sea stack along Oregon's northwest coast. Image from USGS Center for Coastal Geology.

Sea Stack

Sea stacks are blocks of erosion-resistant rock isolated from the land by sea. Sea stacks begin as part of a headland or sea cliff. Relentless pounding by waves erodes the softer, weaker parts of a rock first, leaving harder, more resistant rock behind.

Click here to see Jump-off Joe, a sea stack, erode over 100 years.

Return to Where Parks Meet the Sea index


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