Creation of the Teton Landscape The Geologic Story of Grand Teton National Park
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English
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CREATION OF THE TETON LANDSCAPE The Geologic Story of Grand Teton National Park
CONTENTS
FOREWORD
THE STORY BEGINS
First questions, brief answers
An extraordinary story
An astronaut’s view
A pilot’s view
A motorist’s view
View north.—
View west.—
View south.—
View north.—
View west.—
View south.—
A mountaineer’s view
CARVING THE RUGGED PEAKS
Steep mountain slopes—the perpetual battleground
Rock disintegration and gravitational movement
Running water cuts and carries
Glaciers scour and transport
Effects on Jackson Hole
MOUNTAIN UPLIFT
Kinds of mountains
Anatomy of faults
Time and rate of uplift
Why are mountains here?
The restless land
ENORMOUS TIME AND DYNAMIC EARTH
Framework of time
Rocks and relative age
Fossils and geologic time
Radioactive clocks
The yardstick of geologic time
PRECAMBRIAN ROCKS—THE CORE OF THE TETONS
Ancient gneisses and schists
Granite and pegmatite
Black dikes
Quartzite
A backward glance
The close of the Precambrian—end of the beginning
THE PALEOZOIC ERA—TIME OF LONG-VANISHED SEAS AND THE DEVELOPMENT OF LIFE
The Paleozoic sequence
Alaska Basin—site of an outstanding rock and fossil record
Advance and retreat of Cambrian seas: an example
Younger Paleozoic formations
THE MESOZOIC—ERA OF TRANSITION
Colorful first Mesozoic strata
Drab Cretaceous strata
Birth of the Rocky Mountains
TERTIARY—TIME OF MAMMALS, MOUNTAINS, LAKES, AND VOLCANOES
Rise and burial of mountains
The First Big Lake
Development of mammals
Volcanoes
QUATERNARY—TIME OF ICE, MORE LAKES, AND CONTINUED CRUSTAL DISTURBANCE
Hoback normal fault
Volcanic activity
Preglacial lakes
The Ice Age
Modern glaciers
THE PRESENT AND THE FUTURE
APPENDIX
Acknowledgements
Selected references—if you wish to read further
About the authors
Index of selected terms and features
The GRAND TETON NATURAL HISTORY ASSOCIATION
Transcriber’s Notes
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