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A thick and towering chunk of Coconino Sandstone parts the waters of the river near mile 10. At some point in the past, this monolith tumbled into the river after breaking from the canyon walls hundreds of feet above. Les Jones’s early river maps called the boulder Slab Rock.
The lower Grand Canyon, as traveled by Western's 3 or 4 day expedition begins at Whitmore Wash (mile 188) and finishes at Lake Mead (mile 277).
This comprehensive PDF guides include river maps, overview, full itineraries, camping and weather information, details on physical requirements, packing lists and more.
