Seastacks, like this one shaped like the prow of a ship in Cape Kiwanda State Park, Oregon, are chunks of isolated rock resistant to erosion.
海栈的形状有点像俄勒冈州角基万达州立公园里船舶上的船头,是一些孤立的抵抗腐蚀的岩石块。
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They start as part of a headland or sea cliff connected to land. Smashing waves erode the softer rock, leaving harder rock behind in the form of seastacks.
About five million years ago the area was a limestone plateau, but as sea levels rose the effects of surf and rain began to carve out these magnificent cliffs, along with stacks and arches.