Sedimentary Rocks Clastic Non-clastic Limestones Volcaniclastic Terrigenous clastic Others Evaporites Tutts Ignimbrites Mudrocks Sandstones Conglomerates Coal Ironstones Phosphates Siliceous deposits Mineral grains Lithic fragments Biogenic material Chemical precipitates Different rocks may include Different rocks may indude pleces of Different rocks may include Different rocks may indlude: Quartz Mica Peldspar Calcite etc. Limestone Mudrock Volcanic rock Metamorphic rock Chert etc. Shells Skoletal material Plant debris Algae/Bacteria Bone etc. Carbonates Chlorides Sulphates Silica etc. Fig. 2.1 A classiflcation scheme for sediments and sedimentary rocks. 1) What is the dominant sedimentary rock? Why? 2) What about sand-sized rocks composed of say 50% calcite ooids and 50% quartz and feldspars? PRINCIPAL COMPONENTS

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