Plucking, beneath glaciers, [275].

Plugs, volcanic, [140].

Plunge and flow structure, [37].

Plunging folds, [43];

detection of, [49], [50].

Pluvial periods, [198].

Pocket rocks, in desert, [200], [201], [202].

Poles, wind, of the earth, [263];

earlier, [297].

Poljen, [189], [422].