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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.
Sedimentary rocks are formed when eroded fragments of old rocks and dead organisms settle (usually in seas or rivers) to form a sediment. Over millions of years, layers of sediment build up and are buried one on top of the other.