Twin Sisters Range North Cascades

North Twin Sisters Mountain in the North Cascades. This mountain is a massive and rare occurence of Dunite rock (peridotite rock from the Earth's mantle) uplifted to the Earth's surface. Mount Baker Wilderness Washington #24451

North Twin Sisters Mountain in the North Cascades. This mountain is a massive and rare occurence of Dunite rock (peridotite rock from the Earth’s mantle) uplifted to the Earth’s surface. Mount Baker Wilderness Washington #24451