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Ortley Lava Pillars

From Oregon Hikers Field Guide

The Ortley Lava Pillars, Devils Hole (bobcat)


These oddly shaped pinnacles stand like sentinels in the Rowena Gap, guarding the relatively narrow passage that funneled the massive floods at the end of the last Ice Age. The pillars are eroded elements of the Grande Ronde basalts which flowed through here 17.5 to 15 million years ago. Just west of here are the vertically inclined layers of the Ortley Pinnacles, which mark a fold line, the Ortley Thrust, between Grande Ronde basalts and the somewhat younger Wanapum basalt flows.



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