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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.
1 Sedimentary rocks form when small grains of rock, mud and sand form layers and become compacted over a very long time. 2  Rock breaks into small grains through the process called weathering. 3  Sedimentary rock can be identified as it has visible layers. 4  Examples of sedimentary rock are shale, sandstone and limestone.