Abstract

Assuming sediments to derive exclusively from granite-granodiorite and basalt the chemical composition of the “average igneous rock” is found to be almost identical with that of the Appalachian and Cordilleran igneous rocks as determined by A. Knopf (1916). The total amount of weathered igneous rocks is found to be 194 ± 21, the amount of shale 172 ± 28, sandstone 17.3 ± 21, limestone 12.8 ± 4.3, and dolomite 6.8 ± 3.0, all in kg per cm 2 earth surface. The total amount of sediments formed by complete weathering is thus 209 ± 35 in the same unit. The results and their degree of accuracy are discussed and compared with the results of previous calculations.

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