Abstract
The apparent increase in complexity of the heavy-mineral suites of arenaceous sediments with decrease in age of the deposit is confirmed by compilation from published records. Such increase in number of mineral species in the younger deposits is due to (a) greater complexity of terrane from which the younger sediments were derived or (b) disappearance by solution of the less stable species in the older deposits. The latter alternative is shown to be the correct explanation, since the order of persistence of the common rock-making heavy minerals worked out from the tabulation is identical with Goldich's series, which is the order of survival of minerals subject to weathering. The stability series is expanded to twenty-five common constituents of sediments.
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