James L. Murphy, "Obryan Chert: An Overlooked and Misunderstood Lithic Resource," Ohio Archaeologist 59, no. 1 (Winter, 2009): 28-31.
Abstract:
An unidentified chert source heavily used at the Davisson Farm Site (33-Le-619), Lawrence Co., Ohio, is identified as Obryan Chert (informally known as "southern Vanport"). Local outcrops and examples of artifacts manufactured from this material are described.