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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.
Sedimentary rock can be formed from the accumulation of sediments and are often formed near ancient shores, basins, and lake beds. If an organism dies and is covered by sediments before rotting or being eaten by scavengers, it could eventually become part of the sedimentary layer that lithifies (becomes rock). third type of fossil is the impression left in soft sedimentary layers (particularly mud) of a track (foot step) or body--such as a leaf, shell, fish or bird. Igneous rock forms from magma; no chance for fossils to form there.