Overlying the Fayette sandstone in south Texas are massive or obscurely bedded clays in pastel shades of green, gray, yellow, or pink, containing little or no sand and ash. These clays, because of the rarity of the outcrops and the absence of organic remains, have not received the attention they deserve. Deussen2 included them in the Frio clay. Dumble3 probably included them in the upper part of his “Whitsett beds,” the lower part of which form the upper part of the Fayette sandstone of the present writers. Bailey,4 in most of the sections, assigned them to his...

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