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Chapter 6, Section 3 Sedimentary Rock • Sedimentary Rock • Forms from the cementing and compaction of layers of sediment • Sediment is leftover pieces of other rocks, like sand, clay, pebbles and silt • 3 types of sedimentary rock • Clastic • Chemical • Organic • Clastic • Formed from fragments of other rock • Sediments in a river get sorted out and then bind/stick together • Sorting of sediments • Silt forms…. • Sands form…. • Pebbles and gravels and sands form… • Shale • Sandstone • Conglomerate • Compaction • Cementation • The pressing together of a rock’s materials • The natural “glue” that holds rocks together • Chemical Rock • Forms from dissolved minerals • Minerals precipitate out of water • Halite • Salt Flat • Organic Rock • Form from the remains of plants and animals • Coal • Organic Limestone • Features of sedimentary Rock • • • • • Stratification Fossils Ripple Marks Mud Cracks Geodes • Stratification • Layering • Fossils • Remains of a plant or animal left in a rock • Ripple marks • Left by water • Mud cracks • Left by the lack of water • Geodes • Fine quartz crystals lining the inside of a limestone rock