Ludwig, K.R., and Simmons, K.R., 1992, U-Pb dating of uranium deposits in collapse breccia pipes of the Grand Canyon region: Economic Geology, v. 87, no. 7, p. 1747-1765.
Ludwig, K.R., and Simmons, K.R.
Economic Geology, v. 87, no. 7, p. 1747-1765.
Breccia Pipe, Metallogeny, Geochronology, Isotope Geochemistry, Exploration, Copper, Uranium, Triassic, Jurassic,
