Cirques, horns, aretes and cols. Their progressive development. In the first diagram, valley glaciers have produced cirques but, since erosion had been moderate, much of the original mountain surface has been unaffected by the ice. The result of more extensive glacial erosion is shown in the second diagram. In the final drawing, glacial erosion ha affected the entire mass and has produced not only ciques but also a matterhorn, and jagged knife-edged aretes. Leet and Judson, 1958, p. 235.
Delta. The delta (shaded area) of the St. Clair River has the classic shape of a delta as well as its distributary channels. Leet and Judson, 1958, p. 184.
Mudcracks and mudcrack polygons; a diagram illustrating their formation and burial. The lower part of the diagram shows a thin layer of mud on sand, with mud cracks well developed on the left and curved polygonal plates and ships on the right. In the background, mud is shown overlying the mud-cracked surface. The buried fragments make an intraformational sharpstone conglomerate. In the upper shale layer, V-shaped mudcracks are filled with sand. Several mud lamine separated from the main body of mud curl up along the edges. These may lie convex or concave upward. Shrock, 1948, p. 189.
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.
Graded profile. Diagram to show the elimination of a lake by sedimentation at the inlets and headward erosion at the outlet. Successive positions of graded profiles are shown before and after elimination. Holmes, 1953, p. 155.
Roche Moutonee. Section arcoss a typical roche moutonee, showing the effect of ice abrasion where the rock is sparsley jointed, and of plucking where jointing is well developed. Holmes, 1953, p. 217.
Turbidity currents. Topographical profile along the path of the 1929 Grand Banks, turbidity current showing cable breaks, cores and velocities of the current. Jacobs et al., 1959, p. 241.
