skin is a mean of sedimentary stone
clastic_sedimentary_rock is sedimentary_rock. sandstone is clastic_sedimentary_rock. limestone is sedimentary_rock. sedimentary_rock is stone. sedimentary_clay is soil. sedimentary_rock is not stone. sedimentary is not rock. sedimentary_rock is rock. slate is sedimentary_rock. sedimentary is rock.