The Flattops comprise the northern extent of the White River Plateau. Uplift began approximately 52 million years ago. Three periods of volcanic activity followed the uplift, between 2.4 and 7.5 million years ago. Pleistocene and possibly some early Holocene glaciation occurred approximately 13,000 to 17,400 years ago. This left many glacial lakes and U-shaped valleys. Elevation ranges from 8700 feet to 12,347 feet.

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Marvine Lakes from the air

Southfork Canyon from "The Rim"

Lava Rock - Shingle Peak

Shingle Lake from above

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