MIDAlpha TitleTitleYearColor/BWRunning TimeFormatsAbstractTopics
6467EXOTIC TERRANE*EXOTIC TERRANE*1992color27 minvhs The geologic term "exotic terrane" refers to a group of rocks, a fragment of a formation, that attaches itself to a tectonic plate and ends up at a new site, totally out of place from its origins. Traces the fascinating history of the mysterious rocks in the Hells Canyon region on the Oregon-Idaho border, and provides an overview of tectonic activity along the Pacific coast. Fossils of a tropical coral reef are being discovered in northeastern Oregon. Geologists Tracy Vallier, George Stanley, and Ellen Bishop analyze these rocks and place their origins in a marine environment near the equator. (Restricted to use within the state of Washington only)