Thin, intercalated bentonite beds occur in the Manzanita Limestone Member of the Permian Cherry Canyon formation. These bentonites crop out in the Guadalupe-Delaware Mountains area and have been penetrated by wells in the Delaware basin of Texas and New Mexico. X-ray diffraction analyses indicate that these bentonites, unlike most closely associated bentonites, vary markedly in clay mineral types. The prominent clay minerals noted are: chlorite, illite, randomly mixed-lavered illite-montmorillonite, and mixtures of illite and montmorillonite.

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