Accurate laboratory measurements of dry bulk densities of 79 samples of Paleozoic sediments from a borehole near Barberton, Ohio, are the basis of a vertical profile of 'natural' density which is within 0.013 g per cm 3 of a profile of in-situ density calculated from gravity variations observed using a LaCoste-Romberg gravimeter in an adjacent vertical mine shaft. Changes in bulk volume during or following the coring process are probably so small that core sample density profiles are reliable even when small numbers of samples of aged cores are used. To be used for in-situ density determinations, gravity measurements must be accurate as well as precise.

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