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

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.

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).

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

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.

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

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.

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

Looking northwest from road a few miles west of Taya Taya. Devonian in right hand corner unconformably overlain by steeply dipping well-bedded Jurassic. Cretaceous at left; intrusion of diorite forms prominent boss.

Devil's Tower, Wyoming. Phonolite laccolith (?).

Developmental stage of outwash plains of last ice-age. 1. Glacier. 2. Outwash plain with meltwater rivers. a. Apex of outwash plain. A. Moraine. B. Ice. C. Meltwater deposits. Source: Atlas of Denmark.

Stages in the development of a shore profile following submergence.

Atolls. Development of an atoll y a combination of early wave erosion, subsequent submergence accompanied by upgrowth of the reef, and the effects of solution during the low stands of sea level of the glacial age. Shepard, 1960, p. 235.

Series of diagrams showing the development of a nappe, (after Heim). Diagram copied from a book.