Now Playing:


Oregon Field Guide

Elk Rock in Willamette River

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


blog comments powered by Disqus

More Oregon Field Guide

Roberta's Savanna

OPB | April 02, 2015

Siuslaw Hairy-Necked Beetle

OPB | April 02, 2015

More OPB

Follow Oregon Field Guide

Send Oregon Field Guide A Message

Part of Episode