Contact: Howard Harper
American Geosciences Institute
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)
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