Dorothy Lake/Arapaho Pass Panorama

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Panorama 7/19/19 from knob SE of Dorothy Lake, Indian Peaks Wilderness, Roosevelt NF.

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Initial view east over Arapaho Pass (where trails have a Y junction, Arapaho Pass trail heading away from camera, Caribou Pass trail coming closer) has South Arapaho Peak at the apparent high point. North Arapaho Peak is the high point of a smooth skyline shield to the left of South Arapaho Peak. Notch on right flank of South Arapaho is where Arapaho Glacier Trail heads; that trail is visible on the greenish slope down and right of the notch. Near treeline is the flat of where the Fourth of July Mine was. Canyon to the right is that of the North Fork of Middle Boulder Creek with peaks like Starr Peak and Thorodin Mtn and in the distance. Farther right, the high point with snow on the face is Mt. Neva. From there to the right the ridgeline is the Continental Divide. The far shore of Lake Dorothy still holds ice. The view over Arapaho Pass extends to the Never Summer Range and Continental Divide peaks. The prominent peak with a smooth slope on the left is Mt. Achonee. In the distance in the notch to the right of Mt. Achonee is Longs Peak. Farther to the right, the peak with a smooth saddle on its right is Apache Peak with Navajo Peak is the sharp dark peak a bit farther right before that ridgeline vanishes behind.

Geologically, all the rock in view is Proterozoic, though some late Precambrian sandstone dikes are present in the vicinity of Arapaho Pass down towards the Fourth of July mine. Nearby rocks are Paleoproterozoic metamorphic schists. Old (c. 1.7 Ga) granodiorites make up the summit area of Mt. Neva and south (right) of the Arapaho Peaks and Fourth of July mine. Younger ("Silver Plume", c. 1.4 Ga) Longs Peak batholith granites make up the ridgeline from Mt. Achonee to Navajo Peak. Landforms strongly reflect glacial erosion.