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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.
Therefore, the source of sediment for detrital sedimentary rocks is weathered rock from another form. For example, particles of sand from other rocks can form sandstone, and mud can form shale, which is the most common form of sedimentary rock.Chemical sedimentary rocks are derived from material carried in solution to lakes and oceans.edimentary rocks are secondary rocks, as they are formed from the accumulation of small pieces of pre-existing rock-that is, parent rock. There are two main types of sedimentary rocks, based on the source of the sediment. Sedimentary rock can form as solid particles from weathered rocks.