. Collected reprints, Essa Institute for Oceanography. Oceanography SEDIMENTS OF THE MALACCA STRAIT, SOUTHEAST ASIA 113 areas, but mainly in association with gravel and large shell fragments along the axis of the strait as well as along the continental shelf break where currents tend to winnow out the finer material (fig. 11). An attempt was made to verify the presence of rock areas reported by Shepard, Emery, and Gould (1949), but none were found. Vertical variation of the textural properties appears to be minor. Most cores penetrating only the Recent surface sediments show litt
. Collected reprints, Essa Institute for Oceanography. Oceanography SEDIMENTS OF THE MALACCA STRAIT, SOUTHEAST ASIA 113 areas, but mainly in association with gravel and large shell fragments along the axis of the strait as well as along the continental shelf break where currents tend to winnow out the finer material (fig. 11). An attempt was made to verify the presence of rock areas reported by Shepard, Emery, and Gould (1949), but none were found. Vertical variation of the textural properties appears to be minor. Most cores penetrating only the Recent surface sediments show little variation whereas those reaching the underlying stiff clay reveal a distinct change in textural properties. Grain size decreases markedly and sorting generally is poorer below this contact. Within the clay the properties again are re- markably uniform. A m core from the southern portion of the Andaman Basin shows little change in the textural parameters with depth. Color.—Color of the grab samples was deter- mined at the time of their collection by com- parison with the Rock-Color Chart devised by Goddard, et al., (1948). Color determination of the wet core samples was made later in the laboratory. Nearly all samples can be approxi- mated by five main colors if minor transitions are ignored: grayish olive (10Y4/2), olive gray (5Y3/2), light olive gray (5Y5/2), dusky yellow green (5GY5/2), and medium gray (N5). Sedi- ment colors often indicate different depositional environments and are commonly related to such parameters as grain size, sorting, or carbonate content (Niino and Emery, 1961, p. 749). This relationship does not appear to hold true for the Malacca Strait. The grayish-olive material found over much of the Central and Northern regions includes sediments varying in texture from mud to sand. This variation of texture is also true for the other colors. It appears that in the Malacca Strait sediment color is not signifi- cantly indicative of the conditions in th
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