Diabase dike. Fault Mountains. Hanging glaciers. Mount Moran, Teton Mountains, Wyoming.

Diagram showing the stages in the development of shoreline emergence of the coastal plain type. N nip, SB sub-marine bar, L lagoon, B barrier island, I inlet, TM tidal marsh. Strahler 1960, p. 422.

Diagram of a beach and its parts. Length of area shown, several hundred feet; vertical exaggeration about twice. Dunbar and Rodgers, 1957, p. 68.

A drainage system consists of many small basins, each adjusted in size and shape to the magnitude of the stream it serves. Streams shown by solid lines; divides by dashed lines. Strahler, 1960, p. 375.

European cave bear, 'Ursus spelaeus. Stirton, 1959, p. 350.

Diagram of a fault cutting horizontal strata. A, the fracture before displacement; B, after displacement but before erosion; C, after erosion of fault scarp (Emmons, Thiel, Stauffer, Allison, 1955, p. 461).

Diagram of a fault cutting horizontal strata. A, the fracture before displacement; B, after displacement but before erosion; C, after erosion of fault scarp (Emmons, Thiel, Stauffer, Allison, 1955, p. 461).

Diagram showing the development of a glacial trough. A During maximum glaciation the U-Shaped trough is filled by ice to the level of the small tributaries. B After glaciation the trough floor may be occupied by a stream and lakes. C If the main stream is heavily loaded it may fill the trough floor with alluvium. D Should the glacial trough have been deepened below sea level, it will be occupied by an arm of the sea, or fjord. Strahler, 1960, p. 394.

Ground sloth and glyptodonte. Colbert, 1955, p. 258.

Diagram of beaded esker.

Diagram of 'Bison antiquis' and the Folsom point. Stirton, 1959, p. 521.

Erosional development of horizontal sedimentary strata. The development of cliffs is accentuated here, as is typical of an arid climate. Strahler, 1960, p. 455.

Orogeny. Diagram showing Grigg's dynamic model to simulate the action of subcrustal convection currents and the response of the crust. The stage illustrated shows the development of a crustal downfold (root or tectogene) with outward thrusting near the surface in response to the currents set up by the rotation of the drums. The substartum in the model is very viscous waterglass, and the continental crust is a mixture of heavy oil and sand. Holmes, 1953, p. 412.

Diagram of mantle of decomposed rock, topped by soil overlying bedrock. Strahler, 1960, p. 275.

Diagram showing modes of occurrence of various types of glacial gravels which have economic significance (Thornbury 1956, p. 576).