In the Terlingua district at the top of the Austin chalk there are 20 or 25 feet of strata which form a transition to the Taylor marl. The typical chalky and slaty limestones of the normal Austin become shaly, slightly sandy, and darker in color. Small lenses and streaks of coarse shell coquina occur, and at one locality there are small but well developed limestone reefs. The latter are located in Sec. 248, Block G. 4, about mile east of the Fletcher Shaft of the Esperado Mining Company.
The reefs show a considerable range in size and variation...
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