The artifact known as the Adena pipe, which is a prehistoric effigy pipe that was discovered in 1901 by William C. Mills within a burial mound near Chillicothe and that was created by the ancient Adena culture from native Ohio pipestone, is adopted as the official state artifact.
History. Added by 130th General Assembly File No. 11, SB 33, §1, eff. 8/15/2013.