Download The American Alps: The San Juan Mountains of Southwest by Donald L. Baars PDF
By Donald L. Baars
The yank Alps explores the geologic background at the back of the San Juans. From basement rock billion years outdated throughout the ebb and circulate of historical seas and successive classes of uplift, the San Juans are an open booklet to the heritage of the planet. an invaluable and obtainable publication for someone dwelling or touring within the big-mountain kingdom of southwest Colorado.
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Additional resources for The American Alps: The San Juan Mountains of Southwest Colorado (Coyote Books)
Example text
The quartzite blocks formed low ridges, islands, or promontories, and the gneiss and granite outcrops were valleys, or shallow inlets of the sea, as sands that would become the Ignacio Quartzite were spread across the land in Cambrian time. Where did all that sediment go that was removed from the Precambrian basement during the billion years before Cambrian time? That is anybody's guess. Thick sedimentary deposits of this age are found to the west in Grand Canyon and to the north in the Uinta Mountains.
Hot Rocks After faulting was well underway and the quartzite section was in place, a period of intrusive igneous activity occurred in what would become the San Juan Mountains. The word igneous refers to fire, and in geologic circles it means that there was sufficient heat available to melt rocks in the earth's crust. If the resulting molten mass tried to elbow its way to the surface and didn't make it, the cooled rocks are called intrusive igneous rocks. If they reached the surface, they flowed as lavas or ash that cooled to form extrusive igneous rocks.
17 Chapter 4 The Early Years 35 Chapter 5 Ancestral Rockies 47 Chapter 6 Big Red 59 Chapter 7 The Dull Days 65 Chapter 8 Uplift 73 Chapter 9 Cenozoic Strip Tease 79 Chapter 10 Enter Man 87 Part Two: Geologic Tour of the San Juan Mountains Chapter 11 Mountaineering Geology 101 Chapter 12 San Juan Skyway 117 Chapter 13 The Silverton Railway 153 Four Corners Region Place Names 159 Glossary 175 Index 181 Page vii INTRODUCTION Without a doubt, the San Juan Mountains, nestled in southwestern Colorado, are the most alpine, scenic, and geologically fascinating ranges in the southern Rocky Mountains province.