Abstract
Rates of sedimentation in the Pacific, Indian and Arctic oceans as determined by magnetic reversal studies appear to be in accord with those based upon ionium/thorium geochronologies when comparisons are made on a regional basis. The correction factors of Ku et al. applied to ionium/thorium measurements on the assumption of open-barrel core shortening lack justification in view of recent stratigraphic studies. Finally, the assumption of the Lamont workers of a constant rate of accumulation for the last several hundred years in these pelagic deposits disregards the coherent fine structure in the ionium/thorium depth profiles.
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