Abstract
We are pleased that Haynes et al. (1) have verified our discovery of a 12.9-ka peak in magnetic grains from the Clovis-age surface (YDB) at the Murray Springs site (2) that is even higher (8.2 g/kg) than we reported (2.6 g/kg), consistent with variable deposition. Haynes et al. (1) also reported much larger microspherule concentrations in the YDB, up to 37,000/kg, compared with 109/kg that we found in bulk sediment. Their elemental analysis of magnetic grains is similar to …
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