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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.
 +++  Fossils do not form into sedimentary rock, but as th â¦ e question  says, are in many, though not all sedimentary rocks. A fossil is  the cast of a dead organism whose decayed-away tissues or bones are  replaced by minerals in the parent sediment.Oil and coal are fossil fuels formed from organic debris, but  other fossils do not turn into them.  .  Metamorphic rocks are formed from any other rock by heat and/ or  pressure, not necessarily by heat alone; but metamorphism generally  destroy any fossils in sedimentary rocks undergoing the change.