No abstract

We report the "Be and Be contents of 22 sediment samples of lacustrine silt from the Wilson Creek section of Mono Lake, California. The section spans about 20-35 kyr B P and contains a record of a geomagnetic excursion for which the relative palaeointensity is estimated from the ratio of natural remanent magnetization to anhysteretic remanent magnetization. The "Be contents of the excursion samples are somewhat higher than the average. of non-excursion samples (0.24 +_ 0.02 versus 0.15 * 0.02 dpm kg-'). It is clear however that geomagnetic effects are not the sole cause of the observed variations.