Note 9 — RECONSTRUCTION AND INTERPRETATION
Reading edition
American Journal of Science, Vol. 257, No. 1, Jan. ’59, p. 21 “Lamont Natural Radiocarbon Measurements V.” Dates are now available for Signal Butte, Ia: L 385 B, 4550±220 years and Signal Butte Ic: L 385 D, 4170±250 years. However, they may suggest that there is little time lapse between the cultures of Signal Butte I.