Donald L. Baars - The Colorado plateau: a geologic history

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title	:	The Colorado Plateau : A Geologic History
author	:	Baars, Donald L.
publisher	:	University of New Mexico
isbn10 | asin	:	0826305997
print isbn13	:	9780826305992
ebook isbn13	:	9780585179001
language	:	English
subject	Geology--Colorado Plateau.
publication date	:	1983
lcc	:	QE79.5.B3 1983eb
ddc	:	551.7/009791/3
subject	:	Geology--Colorado Plateau.

Page i The Colorado Plateau

Page ii

Page iii The Colorado Plateau A Geologic History Donald L. Baars University of New Mexico Press Alburquerque

Page iv Library of Congress Cataloging in Publication Data Baars, Donald L. The Colorado plateau. Rev. ed. of: Red rock country. 1st ed. 1972. Bibliography: p. Includes index. 1. GeologyColorado Plateau. I. Baars, Donald L. Red rock country. 1972. II. Title. QE79.5.B3 1983 551.7'009791'3 83-1349 ISBN 0-8263-0598-9 ISBN 0-8263-0599-7 (pbk.) 1983 by the University of New Mexico Press. All rights reserved. Manufactured in the United States of America. ISBN (clothbound) 0-8263-0598-9 ISBN (paperbound) 0-8263-0599-7 Library of Congress Catalog Card Number 83-1349. Seventh paperbound printing, University of New Mexico Press, 1998

Page v CONTENTS Part One The Early History 1 The Grand CanyonAn Open Book 3 2 Journey into the Geologic Dark AgesThe Grand Canyon by Rubber Boat 34 3 The Plot ThickensPaleozoic Rocks of the Canyonlands 49 4 Bits and Pieces of Paleozoic Rocks 94 5 The American AlpsThe San Juan Mountains, Colorado 131 Part Two Post-Paleozoic Landscapes 6 Forests and UraniumTriassic Time 157 7 JurassicThe Age of Dinosaurs 174 8 The Last of the Great Inland SeasThe Cretaceous Period 190 9 Orogeny Molds the LandTertiary Time 203 10 Erosion Sculpts the LandPleistocene Time 221 Part Three Enter Man 11 Indians and Explorers 235 Bibliography 249 Index 269

Page 1 PART ONE THE EARLY HISTORY Lower Cataract Canyon as it appears after inundation by Lake Powell in Glen Canyon National Recreation Area, southern Utah. Canyon walls of Pennsylvanian and Permian age rocks.

Page 3 1 The Grand CanyonAn Open Book Preface The Grand Canyon of the Colorado River is one of the most magnificent natural spectacles of this earth. Its mile-deep chasms and intricate tributary gorges provide the greatest scenery in the United States and an inspiring recreational area for people of all ages. To those who view it from the rim, it is an unbelievably large gash into the otherwise nearly flat plateau that surrounds it in all directions. Its walls are obviously composed of numerous layers of multi-colored rocks that appear to change colors as readily as a chameleon with the changing light of evening. This, to most visitors, is the magic of Grand Canyon. To those hardier souls who venture into the canyon, the huge size and grandeur of Grand Canyon take on greater meaning. The rock layers become formidable cliffs that are insurmountable except by way of narrow, winding trails that have been carved from the precipice. The tributary gullies that seemed insignificant from above become major canyons in their own right, providing myriad obstacles to travel along the layers. As one descends to the inner realms of the canyon, the walls and remnant towers of the sinuous tributaries become towering mountains that guard the river from intruders. The great depth of the canyon is better appreciated when one realizes that one is passing a continuous series of plant and animal habitats that generally range from southern Can-

Page 4 Grand Canyon from the south rim. The entire Paleozoic section is exposed in the alternating ledges and slopes from the erosive processes of the Colorado River as it carved its path into the nearly flat-topped plateau.

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