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Geosphere; February 2008; v. 4; no. 1; p. 183-206; DOI: 10.1130/GES00133.1
© Geological Society of America

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Figure 14. At river mile 246, the top of the Spencer flow exhibits abundant evidence that the free-flowing Colorado River was once established on top of this distal Black Ledge flow. Large, $~$ 5-m-diameter potholes and channel forms are preserved at this location. The river level here is now controlled by Lake Mead. Predam river levels were $~$ 30 m lower (Karlstrom et al., 2007). (Photo by Laura Crossey)

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