Petrographic work on the fuller's earths of Texas has led to the following conclusions: (1) These fuller's earths are derived from volcanic dust and tuff and are bentonites in the strict sense of the term. (2) The source of the many Tertiary materials is the same as that of the Catahoula tuffs to the southwest, while the source of the one Cretaceous deposit investigated cannot be determined at present. (3) The mineral of the fuller's earths is related to the minerals of the montmorillonite-beidellite group but represents a species as yet undescribed.

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