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.
State artifact
Ohio Rev. Code Ann. § 5.075, under Chapter 5 | State Insignia; Seals; Holidays.
Ohio Rev. Code Ann. § 5.075