Illustration of the Fishing Lakes, Qu-Appelle Valley in 1858. Copied from a book. Pioneer Geologists in Saskatchewan.

The pool of Geysir with Bob Clark, New Zealand, in background. August 9, 1960.

Arcs. The primary arcs or elements of the two active orogenetic belts of the continental fracture system. Jacobs et al., 1959, p. 291.

The principal parts of a slump type landslide. Putnam, 1964, p. 255.

The quahog, 'Venus mercenaria' Linne, showing how age may be reckoned by counting the more prominent growth lines. Three and a half years old; three inches long. At the same time each year a notch is filed into the edge of the shell.

Delta. The rapid growth of some deltas is represented by the delta of the Po River, Italy. The entire land area on the map is within the delta area. The stippled section of the delta was built between 1559 and 1869.Leet and Judson, 1958, p. 184.

The theory of drifting continents according the Wegener. One protocontinent, Gondwanaland, existing through most of geologic time (A), but later broke into "blocks: (B), and "drifted" to their present positions (C). Dotted areas on continents are areas formerly covered by shallow seas. Zumberge, 1958, p. 65.

Photograph of a watertank at Mohenjo Daro. Shows bituminous layer. Photograph copied from a book.

Theoretical concept of a continental shelf, consisting of a wave-cut terrace inside and a wave built terrace outside. Shepard, 1960, p. 96.

Thermal regime of ground at Skovorodino, Siberia (1928-30). Air temperature are lowest in December and January, but ground at 1.5 and 2 metres just begins to freeze at that time with attendant heaving which attains greatest intensity in February-March when ground is coldest after which temperature rises again. (Muller, 1947, p. 20).

Thingvellir, a graben bounded by straight-lined chasms (gjas) running parallel, approximately NNE-SSW through the lava. They are tension (pulled apart) open fissures. Vertical displacement along some gjas, but not along other. August 8, 1960.

Very thinly, "shaly", bedded dolomite as exposed at station WK62. Cambrian Macdougal group. Wednesday, July 15, 1959.

Third glacial period (Wurm). Old moraine landscapes (1) and outwash plains (3), in front of glacier (2). A. Old moraine deposits and preglacial deposits. B. Meltwater deposits. C. Moraine from the third glacial period. Source: Atlas of Denmark.