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| Seastacks at Rialto Beach in Olympic National Park. During the last ice age of the Pleistocene Epoch, sea level was more than 300 feet lower than it is today. When the glaciers started melting about 15,000 years ago, sea level began to rise, and shorelines migrated landward. Wave erosion is constantly carving away at the shore leaving behind more resistant rocks as sea stacks offshore. |
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