NEW LAKERIDGE, Or. — An Oregon construction worker discovered a 2,000-pound rare rock believed to have arrived in the state on a glacier 15,000 years ago.

(Photo courtesy KATU TV)

The Tualatin Heritage Center, which took the rock for display as part of its Ice Age flood exhibit, said the rock likely formed in Montana or Canada and came to Oregon as part of a glacier during the Missoula Flood about 15,000 years ago.

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