Abstract
Introduction
Objectives
Acknowledgments
Geologic setting
Paleocene and Paleocene(?) rocks
Gringo Gulch Volcanics
Stratigraphy and petrography
Lower member
Upper member
Age
Environment of deposition
Volcanics of Red Mountain
Intrusive rocks
Plugs of Gringo Gulch area
Dacite porphyry
Microgranodiorite
Cottonwood Canyon dike swarm
Helvetia stocks
Granodiorite
Quartz diorite
Greaterville intrusives
Paleocene to Oligocene rocks
Andesitic dikes
Olivine andesite plugs
Rhyolitic volcanics
Quartz vein swarm
Oligocene rocks
Igneous complex of the southern Santa Rita Mountains
Stratigraphy and petrography
Grosvenor Hills Volcanics
Gravel and silt member
Rhyolite member
Rhyodacite member
Dikes and laccoliths in the Grosvenor Hills area
Dikes and stock of the San Cayetano Mountains
Chemistry of the igneous rocks
Fauna and age
Structure
Origin
Rhyolite intrusives of the northern Santa Rita Mountains
Petrography
Chemistry
Age and origin
Miocene(?) to Holocene rocks
Gravel of Nogales
Basin-fill gravel
Piedmont facies
River facies
Tuff beds
Age and correlation
High-level pediment deposits
Intermediate-level pediment and terrace deposits
Low-level terrace deposits
Gravel facies
Silt facies
Youngest gravel
References
Index.