Table of Contents - MWR183: Late Cenozoic Lava Dams in the Western Grand Canyon

Acknowledgments

Abstract

Introduction

Geologic Setting
Methods

Volcanic Phenomena in the Western Grand Canyon

The Uinkaret Volcanic Field
Lava Cascades

Cones, Dikes, and Volcanic Necks

The Lava Dams

Conceptual Models of the Formation and Destruction of Lava Dams
Identification and Correlation
Method of Determining Relative Ages
Types of Lava Dams
Classification and Nomenclature
Key Localities Showing Relative Ages
Isotopic Ages of the Lava Dams
Magnetic Polarity of the Flows

Prospect Dam

Structure
Geometry of Prospect Dam Age
Prospect Lake

Lava Butte Dam

Structure
Geometry of Lava Butte Dam
Lava Butte Lake

Toroweap Dam

Structure
Geometry of Toroweap Dam
Age
Toroweap Lake

Whitmore Dam

Geometry of Whitmore Dam
Age
Whitmore Lake

Ponderosa Dam

Structure
Geometry of Ponderosa Dam
Age
Ponderosa Lake

Buried Canyon Dam

Sequence of Flows in the Ancient Canyon
Remnants on the South Wall, Miles 180 to 183
Downstream Remnants of Buried Canyon Dam
Geometry of Buried Canyon Dam
Age
Buried Canyon Lake

Esplanade Dam

Lower Flows
Upper Series
Isolated Remnants on the North Wall, Mile 184
Remnants on the South Wall, Mile 185.5
Remnants on the North Wall, Mile 187
Geometry of Esplanade Dam
Esplanade Lake

D Dam

Geometry of D Dam Age
D Lake

Lava Falls Dam

Geometry of Lava Falls Dam
Age
Lava Falls Lake

Black Ledge Dam

Geometry of Black Ledge Dam
Age
Black Ledge Lake

Layered Diabase Dam

Geometry of Layered Diabase Dam
Age
Layered Diabase Lake

Massive Diabase Dam

Geometry of Massive Diabase Dam

Gray Ledge Dam

Geometry of Gray Ledge Dam
Age
Gray Ledge Lake

Sources of the Lava Dams

Lake Deposits

Conceptual Model of Sedimentation in the Lakes in the Grand Canyon
Surficial Deposits in the Grand Canyon
Possible Lake Deposits in the Grand Canyon
Summary

Summary and Conclusions

Appendix 1. Implications Concerning Rates of Erosion and Equilibrium in River Systems

Appendix 2. Interpretation of Events in Local Areas

Select Bibliography

Index