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__________________________________________ Introduction. ______________________________________ Localities and geologic ages of the Ulrich and Bassler conodont collections.______________________________ Rhinestreet Shale Member of the West Falls Formation. _____________________________________ "Hardin sandstone" of Ulrich and Bassler. ________ Gassaway Member of the Chattanooga Shale_ ______ Systematic paleontology.

Stratigraphy-Continued Devonian rocks: Martin formation-Continued Paleogeography__ ________.-_-_-_____._____ 81 Distribution of facies and conditions of deposition. ________________ __ ___________ 83 Correlation ________________________________ 85 Carboniferous (Mississippian) rocks: Red wall lime-stone______________________________________ 86 Terminology _______________________________ 86 General description. ______________ __________ 86 Thickness__________________________ 87 Effects of pre-Pennsyl vanian erosion __________ J. S. Williams for assistance in the field and to G. A. Cooper for the identification of the Devonian fossils. The Mississippian fossils were identified by J. W. Huddle with the aid of J. S. Williams and Helen Duncan. Well samples and cores were loaned by the Continental Oil Co., the Union Oil Co. of California, the Sinclair Oil Co., the Museum of Northern Arizona, and the Colorado School of Mines. STRATIGRAPHY r WHITE MOUNTAINS INDIAN RESERVATION EXPLANATION X ___ A' Line of columnar sections shown on plate 11 B ____ Bf Line of columnar sections shown on plate 12 X Location of measured section Location of drilled well from which data were obtained

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