Interpretation of leached outcrops, by Roland Blanchard, 1968.

Part I describes the various processes and substances involved in the creation of leached outcrops including an explanation of the term limonite, and the precipitation of iron and silica compounds from solution; Part II describes the oxidation products of 19 sulfide and non-sulfide minerals and examples of their various oxidation products; references and index.

Bulletin 66, 212 pages, 11x8.5", 28 b/w drawings, 80 b/w photos (including 10 photomicrographs), 22 color photos (labeled as plates), 8 tables (including 1 oversized), 4 appendices, $19.00