Illumination Rock 2,909m (9,543ft) and Illumination Saddle 2,865m (9,400ft). Illumination Rock is a spectacular spire of rotten basalt on the southwest side of Mt Hood, a stratovolcano in the Cascade Volcanic Arc of Northern Oregon. Powerful glacial forces have eroded down a former rock ridge, leaving this sprire shaped like the fin of a fish. The mountain's twelve glaciers are thinning as a result of glacial retreat.
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