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 southwest toward Hobble Basalt Dike, K-Ar age of 3.66±0.54 million years (Ma) (Billingsley and Workman, 2000), in the Moenkopi Formation, Hobble graben in Upper Jump Canyon, 4 miles east of Grand Wash Cliffs.
Summary
View southwest toward Hobble Basalt Dike, K-Ar age of 3.66±0.54 million years (Ma) (Billingsley and Workman, 2000), in the Moenkopi Formation, Hobble graben in Upper Jump Canyon, 4 miles east of Grand Wash Cliffs.