Murphy, James L., "The Radiocarbon Date from the Lyman Earthworks (33La2): A Correction and Discussion," Pennsylvania Archaeologist 42, no. 4 (Dec. 1972): 26-28.
Abstract:
A radiocarbon date from the Lyman Site earthworks, Lake Co., Ohio, is corrected to 2090 B.P., indicating an Early Woodland age for at least one northern Ohio hilltop fort.