a sedimentary deposit formed from organic material
clastic_sedimentary_rock is sedimentary_rock. sandstone is clastic_sedimentary_rock. sedimentary_clay is soil. sedimentary_rock is stone. limestone is sedimentary_rock. plant_material is organic_matter. sedimentary_clay is not soil. sedimentary_rock is rock. shale is clastic_sedimentary_rock. sedimentary is rock.