Details from the study of clay and feldspar minerals in the Domengine sandstone, Eocene, and the Modelo sandstone, Miocene, of California are presented. The study supports the contention that under favorable circumstances, gross climatological characteristics of ancient terranes can be induced from mineralogical evidence. Classical methods of establishing the stability of minerals under soil-weathering conditions is inadequate because: (1) the effects of structural details of the host minerals on weathering reaction rates have not been given sufficient consideration; (2) direct host-guest mineral relations have not been established, with the result that inhibitory or accelerative effects of metastable weathering products on host degradation are unclear; (3) micrometeorological influence on the chemical environment at grain boundaries has not been carefully investigated.

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