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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.
Interestingly enough, while sedimentary rocks are found in most places, fossils are not so easy to find. Lots of sedimentary rocks contain no recognizable fossils at all, other than microscopic remains such as plankton, pollen, or spores.ften plants and animals were trapped, being buried in the sediments. As the sediments hardened into sedimentary rock, the dead things hardened into fossils. The vast majority of visible fossils are marine invertebrates, animals that live in the sea and have no backbone, mostly animals with a hard outer shell.