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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.
Sedimentary rocks tend to be more porous than igneous rocks because there is more open space between the individual sediment grains than between the minerals in a crystallized â¦ rock.t was originally a clay (sedimentary rock) which became a shale through intens compaction (most often because of burial) which became a slate (metamorphic rock) t â¦ hrough low-grade regional metamorphism. In general, compaction and low-grade regional metamorphism reduces porosity, so it is not really porous.