Thrust plate of breccia derived from the Age and correlation_____________________ 87 Escabrosa and Black Prince limestones__ 118 Galiuro volcanics___________________________ 87 Thrust faults with lower Precambrian rocks Stratigraphy___________________________ 126 General features________________________________ 96 Structural features affecting the older alluvium_ 127 Pre-Apache deformation~________________________ 97 Development of the topography______________________ 127 Johnny Lyon Hills__________________________ 97 Origin of the principal features___________________ 127 Little Dragoon Mountains___________________ 101 Landslides in the Winchester Mountains and Steele Late Precambrian deformation___________________ 102 Hills________________________________________ 130 Post-Paleozoic-pre-Cretaceous deformations________ 103 Igneous metamorphism of the carbonate rocks__________ 131 Late Cretaceous or early Tertiary deformation_____ 104 Mineral deposits____________________________________ 133 Dragoon Mountains_________________________ 104 Generalfeatures________________________________ 133 Little Dragoon Mountains___________________ 105 History of mining_______________________________ 134 Zone of thrusts southeast of the Texas Copper and zinc.:.___________________________
____-_-____________________._ Introduction. ______________________________________ Priorwork_________________________________________ Mississippian rocks_________________________________ Escabrosa limestone___________________________ Distribution and general character.___________ Stratigraphy. ______________________________ Thickness________________________________ Representative sections____________________ Fauna and correlation of the Escabrosa limestone, by James Steele Williams. _________ __ Collections from Tombstone Hills_______ Collections from Dragoon Mountains____ Collections from Gunnison Hills __________ Collections from other localities________ Character and age of the fauna___________ Register of U. S. Geological Survey collections from localities not in stratigraphic sections described in this report_______ Pre-Black Prince disconformity_________________ Black Prince limestone________-_____-___________ Name.____________________________________ Distribution and topographic expression-______ Stratigraphy-______________________________ Representative sections,_____________________ Thickness________________________________ Fauna and correlation of the Black Prince limestone, by James Steele Williams. _________ Collections from Gunnison Hills. _________ Collections from Little Dragoon Mountains. Character and age of the fauna.._________ Register of U. S. Geological Survey collections from Black Prince localities not in stratigraphic sections described in this report.- ..- .-_______________________ Mississippian-Pennsylvanian disconformity___________ Pennsy 1 vanian and Permian rocks.___________________ Naco group._________________________________ Name and subdivisions_-____________________ Horquilla limestone_________________________ Name.________________________________ Distribution and topographic expression___. Stratigraphy ___________________________ Earp formation___________________________ Name and type locality_______________ Distribution and topographic expression. __ Stratigraphy ___________________________ Representative sections__________________ Thickness____________________________ Conditions of deposition.________________ Colina limestone_________ T ________________ Name_____________________________ Distribution and topographic expression. __ Pennsylvanian and Permian rocks-Continued Naco group-Continued Colina limestone-Continued Stratigraphy.
Mesozoic rocks in the Sierrita Mountains, Pima County, Ariz., comprise more than 20,000 feet of terrestrial sedimentary and volcanic rocks and are divided into eight formations. Three formations are newly named in this report. These eight formations are not all found at any one place, however, and none has yielded closely datable fossils. Local geologic relations, radiometric age determinations, and regional correlations suggest that three of the formations are Triassic, one is Upper Triassic or Lower Jurassic, one is Lower Cretaceous (?), one is Lower Cretaceous, and two are Upper Cretaceous. litic flows. The formation lies unconformably on the Demetrie Volcanics, on Jurassic and Triassic(?) intrusive rocks, and on the Ox Frame Volcanics. South of the mountains the Red Boy is overlain unconformably by gravels and volcanic rocks of middle Tertiary age.
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