Rocks that originate on the earth's surface from the weathered fragments of other rocks, through chemical precipitation or from deposition of organic material.
Clastic sedimentary rocks are those derived from clasts (broken fragments) of other rocks. Sandstone and conglomerate are examples. Massive beds of halite or gypsum are examples of chemical precipitates. Coal, peat and limestone are examples of the result of the deposition of organic material.