Billingsley, G.H., Goodwin, G., Nagorsen, S.E., Erdman, M.E., and Sherba, J.T., 2019, Geologic and related photographs of the Grand Canyon region (1967–2010): U.S. Geological Survey data release, accessed [Month Day, Year], at https://doi.org/10.5066/F7WS8SHW.
Summary
View of Pleistocene columnar basalt (photograph CI71), along Whitmore trail, west of and above river mile 188.0.
Summary
View of Pleistocene columnar basalt (photograph CI71), along Whitmore trail, west of and above river mile 188.0.