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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.
Crude oil is found trapped in some of the sedimentarysedimentary: Sedimentary rocks are formed when rock fragments are deposited and pressed together. rocks of the Earth's crust. Millions of years ago, huge numbers of microscopic animals and plants - plankton - died and fell to the bottom of the sea.