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pg 006a: Geology of the Marathon region, Texas Publication 6445288.

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U. S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 187 PLATE 1 A. VIEW LOOKING SOUTHWEST FROM SUMMIT OF HORSE MOUNTAIN. Shows novaculite ridges.

B. HOUSETOP MOUNTAIN FROM SOUTH. Shows angular unconformity between Lower Cretaceous (Ke, Edwards limestone; Kcm, Comanche Peak limestone, Walnut Clay, and Maxon sandstone; Kgr, Glen Roseformation) and Pennsylvanian (Ct, Tesnus formation).

 

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