The Canyon Group comprises an alternating sequence of limestone and shale formations, with sandstone members being common in the shales. The entire succession is crudely cyclic. Within the thickest limestone formation, the Winchell, detailed petrographic studies have shown the existence of regular vertical changes in texture. Three textural units occur, each commencing with arenitic textures at the base and grading upward to lutitic textures in the upper portion. These have been traced over several units and are believed to be referrable to regular changes in the depositional interface of the Winchell Bank with respect to energy base.
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Brooks, James E. and Bretsky, Peter Jr.
"A Preliminary Report on the Pennsylvanian Canyon Carbonates in North Central Texas,"
Journal of the Graduate Research Center: Vol. 35:
2, Article 4.
Available at: https://scholar.smu.edu/journal_grc/vol35/iss2/4