nearly all communication are lost in sedimentary stone
slate is not sedimentary_rock. sedimentary_rock is stone. sedimentary_rock is not rock. sedimentary_rock is not stone. sedimentary is not rock. sedimentary_clay is not soil. carbonate_rock is not sedimentary_rock. clastic_sedimentary_rock is not sedimentary_rock. sedimentary_rock is rock. sedimentary is rock.