Abstract
Magnetic polarity measurements from a well dated (15.6–13.7 Ma) volcanic section in southern Nevada allow resolution of controversies in the calibration of the Middle Miocene polarity time scale. A sequence of lavas yielding exclusively reversed polarities dated at 15.5–14.9 Ma can be confidently identified as C5Br, and the C5Cn.ln(y) reversal is bracketed between 15.67 and 15.48 Ma (relative to TC = 27.92 Ma). Integration with other recent studies shows that polarity chrons C5Cr–C5ABr are now confidently correlated with lava flows dated from 16.9 to 13.4 Ma by the 40Ar/39Ar method.
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