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exists and is an alternate of . Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains. Dead organisms can become sediments which may, under the right conditions, become sedimentary rock. Igneous rock forms from magma; no chance for fossils to form there.
Clastic or detrital sedimentary rocks are made of sediments that are the result of weathering and transport. Chemical rocks are created from chemical precipitation. Biochemical or organic rocks are made up biological remains. sedimentary structure is a structural feature in a sedimentary rock formed as a result of weathering or transportation. Types of sedimentary structures include: stratification, cross bedding, graded bedding, ripple marks, oscillation marks, mud cracks, raindrops, and trace fossils.