. Bulletin of the Geological Society of America. Geology. STRUCTURAL CONTROL OF NETWORKS 135 within the rock are able to exert a control over the location of water- ways. We have already emphasized the fact that in high latitudes, where there is generally scant cover of vegetation and where frost work is the dominant weathering process, such control will be at a maximum and repeating relief patterns will in consequence be given a strong expression. In western Greenland, where the fjords and valleys appear as definitely 0] iented right lines on the map, it has been shown that outlet glaciers. F
. Bulletin of the Geological Society of America. Geology. STRUCTURAL CONTROL OF NETWORKS 135 within the rock are able to exert a control over the location of water- ways. We have already emphasized the fact that in high latitudes, where there is generally scant cover of vegetation and where frost work is the dominant weathering process, such control will be at a maximum and repeating relief patterns will in consequence be given a strong expression. In western Greenland, where the fjords and valleys appear as definitely 0] iented right lines on the map, it has been shown that outlet glaciers. Figure 12.—Rain-sculpturing controlled ty Joints Coast of southern California. (After a photograph by Fairbanlis) from the inland ice actually clean out the talus deposits which collect in the bottom of clefts as a result of frost action upon their walls. These clefts, in consequence, are extremely narrow canyons which flare at both the top and bottom, as is shown in figure 11.^° "They are," says von Drygalski, "too little developed for running water to have had a part in forming them.'^ " E. von Drygalski: Gr5nland-ExpeditIon der Gesellschaft fiir Erdkunde zu Berlin 1891-1893, pp. .S6-43, pi. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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