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Chronicle OnLine > Features > Area geology
Okanogan Country Geology
(or How the Okanogan grew)

Glen and Elizabeth Widel photo
Gneiss (or mylonite) exposed just north of Riverside. The rock has been altered from an earlier form, probably sedimentary, with new hot solutions added and then tremendous pressure applied so that it gets plastic and its crystals reform. Sometimes the formation even indicates the direction in which the pressure operated.
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