sedimentary rocks are formed by sediment compacting / cementing together
sedimentary is rock. arenaceous_rock is sedimentary_rock. shale is clastic_sedimentary_rock. sedimentary_clay is soil. limestone is sedimentary_rock. sandstone is clastic_sedimentary_rock. clastic_sedimentary_rock is sedimentary_rock. limescale_buildup is gradual_accumulation. sedimentary_rock is rock. sedimentary_rock is stone.