Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 67

sedimentary rock - Formation, Classification, Other information

rocks composed chemical formed

Consolidated deposits composed of material laid down by water, wind, ice, or gravity, or by chemical precipitation. They are generally classified into three groups: Clastic rocks are made up of fragments of pre-existing rocks or minerals, and bound together by a cementing medium which is formed after deposition, eg shales, sandstones, and conglomerates. Organic rocks are composed largely of the remains of living organisms, eg coal and fossiliferous limestone. Inorganic rocks are formed by chemical precipitation from supersaturated solutions, eg some limestones and evaporite deposits.

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