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Geology of National Parks, 3D and Photographic Tours

Caption below states:
~ Mile 0: Contact of Moenkopi Formation and underlying Kaibab Formation at Lees Ferry. Mileage along the river trip starts at the Colorado River boat ramp at Lees Ferry. In the following tripe, the mileage is based primarily on the guidebook of Belnap and Belnap-Evans (1989).
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