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Chapter 2: Rocks: Section 3: Sedimentary Rock Name ____________________________________ #_______ date _____________ Rock Origins of Sedimentary Rock Composition of Sedimentary Rock Sedimentary rock- Three classifications for sedimentary rock are based on how the rock is formed. This rock is formed when rock sediments are transported from one place to another. Eventually these sediments deposit into layers. Over time they begin to be compacted and cemented together. Forms at the Earth’s surface with out heat and pressure. Strata- the layers found in sedimentary rocks. 1). Clastic Sedimentary Rock- is made of other fragments of other rocks and minerals. 2). Chemical Sedimentary Rockforms from solutions of minerals and water. Limestone is and example of this type of rock. Organic Sedimentary Rock 3). Organic Sedimentary RockMost limestone forms from remains of animals that once lived in the ocean. This is made up of calcium carbonate that animals get from the seawater. They eventually become cemented together to form fossileferous limestone. Fossils- are the remains or traces of plants and animals that have been preserved in sedimentary rock. Fossils give us tremendous amounts of information about ancient life forms and how they lived. Most fossils come from animals that lived in the oceans. Sedimentary Rock Structures The most characteristic feature of sedimentary rock is stratification, or layering. Strata differ from one another depending on the kind, size, and color of their sediment. The rate of deposition can also affect the thickness of the layers. Sedimentary rocks sometimes record the motion of wind and water waves on lakes, seas, rivers, and sand dunes.