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Grande Ronde Feeder Dikes

National Natural Landmark

Photo
Photo of Grande Ronde Feeder Dikes
IN BRIEF
The Grande Ronde Feeder Dikes is the best example of basalt dikes, the congealed feeder sources of the Columbia River basalt plateau. The site illustrates how these flows originated by eruption along multiple fissures. Ownership: Private.

DESIGNATION DATE
1980
update on 07/09/2004  I   http://www.nature.nps.gov/nnl/registry/usa_map/states/washington/NNL/GRF/index.cfm   I  Email: Webmaster
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