Collet, L. W., cited, [39].

Colorado desert, [74].

Color, of minerals, [450].

Cols, [374];

origin of in cirque intersection, [372].

Comb ridges, [373].

Compass, geologist’s, [47], [48].

Competent layer, [42];

in relation to lava reservoirs, [144].

Composite cones, caldera of, [126], [127].