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Elk Rock in Willamette River

OPB | Feb. 1, 1999 7:30 p.m.

Millions of years ago, the Pacific Ocean covered the area where Portland now stands. An underwater volcano grew to a mountain the size of Mount Hood. That mountain is now the small outcropping known as Elk Rock Island — nearly all of its mass is buried in sediment and later lava flows.

First Broadcast: 1999
Producer: Jim Newman


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