- rocks formed by life-processes of water-dwelling organisms, such as coral reefs, consolidated fragments of shells of organisms, or preserved plant remains in swamps (coal) V. SEDIMENTARY ENVIRONMENTS: important in earth history interpretation by studying the conditions under which sedimentary rocks are formed, one can deduce the history of a rock , including info about the origin of its component particles, the methods and length of transport, and the nature of the place where the grains came to rest ( environment of deposition ) since sediments are deposited at the Earth's surface, they contain many clues about the physical, chemical and biological conditions that existed in the areas where the sediments accumulated (for example: shallow marine with good water circulation, warm tropical climate;
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