the formation of organic rocks is usually found in the ocean
arenaceous_rock is sedimentary_rock. natural_elevation is geological_formation. shale is clastic_sedimentary_rock. group_of_sand_dunes is naturally_occurring_tangible_substance. ocean is home_to_multiple_organic_creatures. ocean_zone is natural_inanimate_thing. find_underground is rocks. find_underwater is aquatic_plant. oceanfront is geological_formation. find_underwater is sand.