Slate, clay, [466].
Slichter, C. S., cited, [195].
Slickensides, on fault, [60].
Smith, George Otis, cited, [173].
Smithsonite, [456].
“Smoke” of volcanoes, nature of, [128].
Smyth, C. H., Jr., cited, [157].
Snake river, Idaho, lava plains of, [102].
Snickers Gap, [177].
Snow, B. W., cited, [193].