Forest physiography; physiography of the United States and principles of soils in relation to forestry . unding mountains to the Pacific results in a marked rainfall andhence they supply more water for irrigation than is commonly suppliedto the alluvial plains of the West. The streams that descend form theseaward slopes of these mountains and water the alluvial plain betweenthem and the sea are, as such streams go, of great size and permanenceof flow. The soils are generally well disintegrated arid land soils witha high percentage of soluble plant food. TOPOGRAPHY AND DRAINAGE The valley of so
Forest physiography; physiography of the United States and principles of soils in relation to forestry . unding mountains to the Pacific results in a marked rainfall andhence they supply more water for irrigation than is commonly suppliedto the alluvial plains of the West. The streams that descend form theseaward slopes of these mountains and water the alluvial plain betweenthem and the sea are, as such streams go, of great size and permanenceof flow. The soils are generally well disintegrated arid land soils witha high percentage of soluble plant food. TOPOGRAPHY AND DRAINAGE The valley of southern California, Fig. 44, is divided by the Santa AnaMountains and the Puenta Hills into two parts: (i) a coastal portion,the coastal plain, and (2) an interior portion, the interior valley. Thecoastal plain of southern California is about 50 miles long and 15 to 20miles wide. Its relief is in general low and the regional slope is seaward I Arnold and Anderson, Geology and Oil Resources of the Coalinga District, Cahfornia,Bull. U. S. Geol. Surv. No. 398, 1910, pp. 39-382. PACIFIC COAST VALLEYS 185. i86 FOREST PHYSIOGRAPHY from an elevation of 200 to 300 feet along the inner margin to the saltmarshes and sand dunes of the coast. The chief interruptions of its levelsurface are San Pedro Hill and a low ridge that extends southeastwardfrom the vicinity of Palms. The inner edge of the coastal plain formsa fringe of bench land which contours the higher mountains back of itand forms bluffs except where the mountains approach the coast. Itis somewhat dissected by the canyons of the small streams that crossit. These gullied benches are conspicuous back of Santa Monica andalong the southern base of the Santa Monica Mountains, where they arecomposed of stream-deposited sands, gravels, and clays, in contrast to
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