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Pueblo Mountains
The Pueblo Mountains are a remote mountain range in the United States located mostly in southeastern Oregon and partially northwestern Nevada. The highest point in the range is Pueblo Mountain. The dominant vegetation throughout the range are grasses and big sagebrush; however, there are meadows with cottonwood, aspen, and willow groves along some stream drainages. Most of the Pueblo Mountains are public lands, administered by the Bureau of Land Management. There is very little human development in the Pueblo Mountains, and most visitors come for backpacking cross-country, camping, and hunting.
== Geology ==
The Pueblo Mountains in Harney County, Oregon, and Humboldt County, Nevada, are part of the Basin and Range Province of the Western United States, which is characterized by a series of parallel fault blocks forming long north–south-oriented mountain ranges separated by wide, high, desert valleys. The Steens-Pueblo block fault represents the northernmost extension of these structures. The Pueblo fault is not as massive as the Steens Mountain; however, it is tilted at a 45-degree angle, a much greater angle than the Steens fault. This accounts for the relatively high elevation of the range's main ridgeline, which averages above sea level along its crest.〔("Pueblo Mountain Wilderness Study Area" ) (PDF), ''Nevada Wilderness Study Area Notebook'', Winnemucca Field Office, Bureau of Land Management, United States Department of the Interior, Winnemucca, Nevada, April 2001.〕〔(【引用サイトリンク】title=West Pueblo Ridge )〕
The range is composed of the same basalt that blankets much of southeastern Oregon. However, the Pueblo Mountains also have much older metamorphic rock underlying the more recent basalt flows. These older rocks are exposed along the range’s east-facing escarpment. These rocks may be related to some of the Triassic formations of the Blue Mountains to the north. These strata have diorite and granodiorite intrusions, probably formed in the Cretaceous Period.〔〔〔McKee, Bates, ''Cascadia: the Geologic Evolution of the Pacific Northwest'', McGraw-Hill Book Company, New York, New York, 1972, p. 223. ISBN 9780070451339.〕 The southern part of the Pueblo range has metamorphic rocks rich in quartz impregnated with gold, silver, and copper.〔Juillerat, Lee, ("Hiking the Pueblos" ), ''High on Adventure'' (Vol. II, No. 6), ''www.highonadventure.com'', October/November 1998.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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