Revised geologic cross sections of parts of the Colorado, White River, and Death Valley regional groundwater flow systems, Nevada, Utah, and Arizona

........................................................................................................................................................ 5 Introduction .................................................................................................................................................... 6 Methods ......................................................................................................................................................... 6 Stratigraphy ................................................................................................................................................... 7 Proterozoic and Paleozoic Rocks .............................................................................................................. 7 Late Proterozoic-Paleozoic Facies Belts ................................................................................................ 9 Mesozoic Rocks ....................................................................................................................................... 10 Tertiary-Quaternary Rocks ....................................................................................................................... 10 Structural Geology ....................................................................................................................................... 11 Mesozoic Thrust Faults ............................................................................................................................ 11 Cenozoic Magmatism, Strike-slip Faults, Normal Faults, and Basin Development .................................. 12 Magmatism ........................................................................................................................................... 13 Strike-slip Faults, Normal Faults, and Basin Development ................................................................... 13 Summary ..................................................................................................................................................... 18 Acknowledgments ....................................................................................................................................... 19 References Cited ......................................................................................................................................... 19 Figures (on Plate 1) 1. Map showing Death Valley, White River, and Colorado flow systems, and study area boundary 2. Index map showing major physiographic features in the study area 3. Location of cross sections and oil wells 4. Isostatic gravity map of the study area 5. Principal structures in the study area

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