<![CDATA[Abstract This research was conducted from May - June 2017 in Beach Pandan district Tapanuli central north Sumatera Province. The purpose of this research is to know the type of material constituents horizontally in Pandan coastal waters. Sediment samples were taken using a grab sampler to take samples from 2 stations consisting of 6 sampling points and then analyzed for composition and organic matter content in sediments.The result showed that the composition of sediments found in coastal waters of pandan consisted of lithogenous( rock, mica, and quartz) and biogenous( litter, foraminifera and molluscs). Especially lithogenous composition of rock dominates the presence in the waters and evenly distributed in each station. The type of rock is derived from erosion and antropogenic activity in the surrounding waters. Keywords: Composition, Horizontal Sediment, Pandan Beach.]]>
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