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3-Mile Resthouse to 1.5-Mile Resthouse Professional Review and Guide
"The landscape between the 3-Mile and 1.5-Mile resthouses is gentler, as you climb first through the Supai Formation and then enter the Hermit Formation. The landscape is more vegetated, and the ground cover of perennial and annual wildflowers can be very colorful in spring. The soil is quite red, reflecting the desert origin of the sands that comprise much of the Supai Formation. Steeper bands within the Supai indicate thicker accumulations of pure sand, and sloping sections, where silt and mud dominate. The alternating bands reflect the once changing sea level."
--Elizabeth Wenk, One Best Hike: Grand Canyon (Wilderness Press).
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