. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 250 HEEZEN AND AIENAKD [chap. 12 arriving after the echoes from both sides of the trench (Fisher, 1954). In some areas ^^â here detailed siirve3's have been made of the continental margin, it has been discovered that much of the fine-scale relief is subjjarallel to the adjacent margin. This seems to suggest that the tectonic relief throughout the continental margin province is controlled by a single structural system, which Ues pre- dominantly parallel to the continental SCALE IN NAUTICAL MILES 400 Fig. 16. Profile
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 250 HEEZEN AND AIENAKD [chap. 12 arriving after the echoes from both sides of the trench (Fisher, 1954). In some areas ^^â here detailed siirve3's have been made of the continental margin, it has been discovered that much of the fine-scale relief is subjjarallel to the adjacent margin. This seems to suggest that the tectonic relief throughout the continental margin province is controlled by a single structural system, which Ues pre- dominantly parallel to the continental SCALE IN NAUTICAL MILES 400 Fig. 16. Profiles illustrating the marginal trench and outer ridge in the northern Caribbean. (After Heezen et al., 1959.) h. Island arcs Lying on the northwestern margin of the Pacific Ocean are a series of great island arcsâthe Aleutians, the Kuriles, the Japanese and the Marianas. The outer convex side of these island arcs is considered to be the seaward limit of the Asian continent by some petrologists because of the occurrence of andesite. However, consideration of other criteria, such as the depth of water or crustal thickness, makes it clear that most of the great island arcs lie within the Pacific Basin rather than at the margin of the continent. The Phili])pine Sea is roughly. 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 Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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