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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.
Bioclastic rocks are composed of organic debris such as plants (lignite, coal) or shells (coquina, fossiliferous limestone). Chemical Rocks. Chemical rocks precipitate from water. These include carbonates (limestone and dolomite), evaportites (halite, gypsum, anhydrite), and chert (SiO 2).Most sedimentary rocks are derived by processes of weathering, transportation, deposition, and diagenesis.The final texture (grain size, shape, sorting, mineralolgy, etc.) in a sediment or sedimentary rocks is dependent on process that occur during each stage.) Layering (bedding). One of the most obvious features of sedimentary rocks and sediment is the layered structure which they exhibit. The layers are evident because of differences in mineralogy, clast size, degree of sorting, or color of the different layers.