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Report Abuse. Fossils are generally found in sedimentary rocks formed by soft silts and muds. The soft sediment preserves the fine details in the bones, teeth, and leaves of plants. Sometimes sediments fill an opening in a bone or shell and leave behind a cast of the inside of the living thing.ossils cannot form in metamorphic or igneous rocks since metamorphic rocks are formed under extreme pressure and heat and igneous rocks are formed from magma both of which will destroy the fossil. Source(s): Guy of Awesomeness Â· 2 years ago.
2 The fossils are destroyed if the rocks are subjected to great heat and pressure (In the formation of metamorphic rocks). Igneous rocks are formed from molten rock and therefore has no record of fossils. just now. Report Abuse. Sedimentary Igneous rocks have cooled from molten rock, so are very unlikely to preserve any fossils (although casts have been found in lava, this is very rare). Metamorphic rocks have been heated and deformed, this normally destroys fossils.