. Studies in natural history. Natural history; Natural history. DESERT STRIP OP MOLOKAI 43 dunes and linear ridges and to very subordinate quantities which lodge against and around occasional obstructions. At the south- west end of the strip there are extensive deposits of sand filling the heads of some of the smaller gulches and banked over the windward wall of Kakaako Gulch. At present this deep gulch constitutes an obstacle which the sand does not pass in appreciable amounts and no evidence was seen by the writer that it has been extensively blown to the far side at any time in the past. /o
. Studies in natural history. Natural history; Natural history. DESERT STRIP OP MOLOKAI 43 dunes and linear ridges and to very subordinate quantities which lodge against and around occasional obstructions. At the south- west end of the strip there are extensive deposits of sand filling the heads of some of the smaller gulches and banked over the windward wall of Kakaako Gulch. At present this deep gulch constitutes an obstacle which the sand does not pass in appreciable amounts and no evidence was seen by the writer that it has been extensively blown to the far side at any time in the past. /ooo-. Fig. 2. Longitudinal section of the desert strip. Vertical scale exagger- ated four times. See Fig. 1 for location. Downstream from the end of the desert strip Kakaako Gulch is notable for the amount of fine sand which is incorporated in its alluvium and large quantities of the sand no doubt reach the sea at the mouth of this gulch. At the leeward end of the strip the sand is buff to brown in color and contains many grains of weathered basalt from the upland in addition to the fundamental organic constituents, but on the steep slope at the windward end the sand is whiter and more largely consists of debris from corals, algae, molluscan shells and foraminifera. In those parts of the desert which are not wholly covered with sand the surface is commonly abraded to a level from one to five or rarely ten feet below the original soil layer which is preserved in a few small boat-shaped remnants which are capped with sand mounds and rise to eight or ten feet above the eroded surface. Immediately below the old soil level the basaltic geest is deep red in color but becomes increasingly lighter colored with depth and at eight or ten feet is commonly a mottled yellow or orange and gray. Apparently wind abrasion becomes increasingly slow as it reaches the more resistent gray geest and it has at no place un- covered sound basalt in place. In a few places near the west end of the desert
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectnaturalhistory, booky
