James L. Murphy and Irene Stehli, "Age and Provenience of Adena Bone Combs," Ohio Archaeologist 27, no. 3 (Summer 1977): 9-13.
Radiocarbon dates on material from Early Woodland (Adena) burial mounds associated with Adena bone combs indicate that the diagnostic artifact may have been used from ca. 430 B.C. to A.D. 270. Previously unrecorded dates are reported from the Rock Riffle Run Mound (Athens Co., Ohio), the Ricketts and Wright Mound 6 (Montgomery Co., Kentucky), and the C.L. Lewis Stone Mound (Shelby Co., Indiana).