Block diagram of a wave-cut cliff and stack. The base of the cliff is eroded by storm waves but is not reached by smaller waves in calm weather. Zumberge, 1958, p. 198.

Waves. Block diagram of breaking wave showing pattern of wave movement. Note the general condition of eddy development which leads to turbulence. Dapples, 1959, p. 257.

Earthquake. Block diagram showing isoseismal lines and their relation to the epicentre and to the wave paths radiating from the focus of an earthquake. Holmes, 1953, p. 364.

Block diagram showing possible development of Missouri Coteau.

Block diagram showing stages of erosion of a mountain in the Basin and Range province. An initial fault-block form is assumed in stage A, but successing stages might have developped from any initial tectonic form. (A) Fan-free and Fan-based, (B) Fan-dented, (C) Fan-bayed, (D) Fan-frayed, (E) Fan-wrapped, (F) Pan-fan. King 1959, p. 155.

Block diagrams showing changes due to valley glaciation. (A) Unglaciated mature topography. (B) A system of valley glaciers occupies the former stream valleys and causes deep erosion. Frost action causes weathering of unglaciated slopes and provides a source of debris for lateral moraines. (C) Climatic change causes melting and disappearance of glaciers, leaving behind tell-tale topography which includes hanging valleys. U-shaped valleys, lakes, end moraines, and rugged peaks.

Block glide (Eckel, 1958, p. 31).

Block of till in moraine consisting predminantly sand and gravel. Northeast of Herbert, Sask.

Block structure of crust in Japan. Leet, 1948, p. 33.

Large separated blocks of grey Ayavacas limestone in red Cretaceous Moho shale. Believed to be the result of subaqueous slumping. Near Acora.

Blocks of Red-River type Ordovician dolomite collected from drift to be used as building stone. Campus, University of Saskatchewan. Unidentified person in picture.

Blocky or aa lava. Hredavatn, Hotel Bifrost. August 7, 1960.