Millstones Made of French Buhr at Site of Clover Hill Mill, Trumbull County, Ohio (image) American Geosciences Institute Share Print E-Mail Caption A) This is a composite millstone (runner stone) composed of chert segments, tightly bound with iron band. B) This is a composite millstone (bedstone) with deteriorated iron band that has allowed individual segments to separate. C) This is a millstone with deteriorated plaster top from which loose chert scraps were collected. Staff in each photograph is marked in 1 dm segments (for a total length of 1.5 m). Credit J.T. Hannibal et al.; SEPM (Society for Sedimentary Geology) Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.