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Four basic processes are involved in the formation of a clastic sedimentary rock: weathering (erosion)caused mainly by friction of waves, transportation where the sediment is carried along by a current, deposition and compaction where the sediment is squashed together to form a rock of this kind.
Major Concepts. 1  Sedimentary rocks form by the processes of weathering, erosion, transportation, and deposition, or by chemical precipitation. 2  Two main types. 3  clastic: pieces of older rocks (clasts). 4  chemical: precipitated or formed in place. 5  Sedimentary structures are critical to interpreting sedimentary rocks.