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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.
A Guide to Oil Shale, Coal, and Other Sedimentary Rocks By John Bestoloffe When rocks are formed from dead organisms and/or rocks that currently exist, they are called sedimentary rocks.