a sedimentary deposit formed from organic material
sedimentary is rock. shale is clastic_sedimentary_rock. sedimentary_clay is soil. fabrication is creating_from_raw_materials. plant_material is organic_matter. limestone is sedimentary_rock. sandstone is clastic_sedimentary_rock. clastic_sedimentary_rock is sedimentary_rock. sedimentary_rock is rock. sedimentary_rock is stone.