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pg b190a: Fourth annual report of the Geological Survey of Texas Publication 5235917-4.

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TABULAR VIEW OF OCCURRENCE OF THE PLEISTOCENE AND FRESH WATER SHELLS IN NORTHWEST TEXAS.

TERTIARY

THE CONDITION OF THE COUNTRY AT THE BEGINNING OF THE TERTIARY

Within the boundary of my district, there is no evidence, so far as I have yet observed, that the upper Cretaceous ever extended over the great denuded area east of the Staked Plains and west of the present westward extension of the Central Texas Cretaceous area, or that it ever covered this country very far west of its present western boundary along the western edge of the upper Cross Timbers.

It is probable that the lower Cretaceous was much more extensive, and may have at one time covered the entire district where the Triassic, Permian and Carboniferous are now exposed.

 

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