F.M. Phillips, New Mexico Tech

G.I. Smith, USGS, Menlo Park, California

H.W. Bentley, University of Arizona

D. Elmore, H.E. Gove, University of Rochester

Science 222 (1983) 925-927

Measurements have been made of the ratios of chlorine-36 to chlorine in five halite samples from Searles Lake sediments. previously dated by carbon-14, thorium-230, and magnetostratigraphic techniques. The ages calculated from the chlorine ratios are generally concordant with those from the other methods, implying the constancy of the chlorine input ratio over the last million years.