"Colorado River: Origin and Evolution" ed. by Richard A. Young, Earle E. Spamer

This collection of papers on the geology of the Grand Canyon and the Colorado River is an outgrowth of informal conversations among Colorado Plateau geologists over a period of several years.

CONTENTS
Introduction
Section A: Early Tertiary Events and Regional Geologic Setting
The Laramide-Paleogene History of the Western Grand Canyon Region: Setting the Stage
Paleogeomorphic Evolution of the Salt River Region: Implications for Cretaceous-Laramide Inheritance for Ancestral Colorado River Drainage
Paleocene to Early Oligocene Basin Evolution. Southwestern Utah
Fission-track Analysis of Apatite and Zircon from Grand Canyon, Arizona
Laramide Cooling Histories of Grand Canyon, Arizona, and the Front Range. Colorado. Determined from Apatite Fission-track Thermochronology
Section B: Areal Geologic Studies
Age and Depositional Basin Morphology of the Bidahochi Formation and Imphcations for the Ancestral Upper Colorado River
K-Ar Geochronologic Survey of the Hopi Buttes Volcanic Field
Pliocene-Pleistocene Incision on the MogoUon Slope. Northern Arizona: Response to the Developing Grand Canyon
Geomorphic Features and Processes of the Shivwits Plateau. Arizona, and Their Constraints on the Age of Western Grand Canyon
Post-6 Ma Limestone Along the Southeastern Part of the Las Vegas Valley Shear Zone, Southern Nevada
Depositional Environment and Paleogeographic Implications of the Late Miocene Hualapai Limestone, Northwestern Arizona and Southern Nevada
40Ar/39Ar Geochronology of the Hualapai Limestone and Bouse Formation and Implications for the Age of the Lower Colorado River
Pre-Colorado River Paleogeography and Extension Along the Colorado Plateau-Basin and Range Boundary, Northwestern Arizona
Lower Colorado River: Upper Cenozoic Deposits, Incision, and Evolution
Proposed Lower Colorado River Courses Prior to 4.3 Ma, Sonora, Mexico
Section C: Estimating Rates of Incision
Constraints on Timing and Rates of Late Cenozoic Incision by the Colorado River in Glenwood Canyon, Colorado: A Preliminary Synopsis
Quaternary Incision Rates of the Colorado River and Major Tributaries in the Colorado Plateau, Utah
Bedrock Incision Rates for the Fremont River. Tributary of the Colorado River
The Colorado River and the Age of Glen Canyon
Erosional History of the Colorado River through Glen and Grand Canyons
Preliminary Evidence from Grand Canyon Caves and Mines for the Evolution of Grand Canyon and the Colorado River System
Cosmogenic 3He Dating of Western Grand Canyon Basalts: Implications for Quaternary Incision of the Colorado River
Rates of Downcutting of the Colorado River in the Grand Canyon Region
Relating Differential Incision of Grand Canyon to Slip along the Hurricane/Toroweap Fault System
Section D: Geochemistry and Uplift
Application of Sr Isotopes to the Hydrology of the Colorado River System Waters and Potentially Related Neogene Sedimentary Formations
The Bouse Formation and Post-Miocene Uplift of the Colorado Plateau
Section E: Geologic Processes
Debris Flows and Rapids in Grand Canyon: Implications for Erosion Rates and Evacuation of Sediment from Tributary Canyons
Climate Change and the Evolution of Grand Canyon and the Colorado River Delta
Section F: Selected Theories and Speculation
Lake Overflow: An Alternative Hypothesis for Grand Canyon Incision and Development of the Colorado River
Neogene Development of Little Colorado River Valley and Eastern Grand Canyon: Field Evidence for an Overtopping Hypothesis
Headward Erosion Versus Closed-basin Spillover as Alternative Causes of Neogene Capture of the Ancestral Colorado River by the Gulf of California
Section G: Important Extrusive and Intrusive Igneous Rock Units
Volcanic Rocks of the Grand Canyon Area
Appendices
A: Geochron Database
B: Authors and Contact Information
C: Roster of Symposium Attendees
Index
References Cited
Index

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