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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.
Why are fossils found in sedimentary rocks but not in igneous or metamorphic rocks? Igneous rocks are new rocks that are formed from magma, metamorphic rocks are old rocks returning to magma. Sedimentary are the only one in between that exist where living thi â¦ ngs can die and become fossils.