Smaller glaciers spilled into the trunk glacier from the south. Peruvian Gulch and Gad Valley glaciers entered from canyons at Snowbird. White Pine, Red Pine, Maybird and Hogum Canyons’ glaciers entered farther below.

The four principle valleys of Alta and Snowbird. From left to right they are: Albion Basin, Collins Gulch, Peruvian Gulch and a part of Gad Valley beneath the wing of the aircraft. Albion Basin was the source of the Little Cottonwood Canyon trunk glacier. Collins Gulch, Peruvian Gulch and Gad Valley were all occupied by tributary glaciers, which were smaller, did not have the erosional power of the trunk glacier and dig as deeply into their valleys. Almost by definition they left behind hanging valleys.

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