Canyonlands Country: Geology of Canyonlands and Arches by Donald L. Baars

By Donald L. Baars

An easy-to-read geological heritage of the superb crimson rock landscapes in southeastern Utah.Towering crimson buttes, plunging canyon partitions, domes, pinnacles, spires, 10000 unusually carved forms—what customer hasn’t marveled on the land of rock in southeastern Utah that's Canyonlands Country?Canyonlands state bargains a special geological heritage of this striking panorama, in language comprehensible through the non-geologist. the tale is as unusual and engaging because the land itself. every one uncovered rock layer has a special geologic heritage: one is a flow deposit, one other is an old box of dunes, one other used to be deposited through shallow tropic seas. the fairway and Colorado Rivers started carving canyons thirty million years in the past, yet to appreciate such particularly fresh occasions Canyonlands state takes us on a trip of 2 billion years.Tours contain Arches nationwide Park, Island within the Sky, Needles District, The Maze and Elaterite Basin, Labyrinth and Stillwater Canyons, Meander Canyon, and Cataract Canyon. 

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Extra info for Canyonlands Country: Geology of Canyonlands and Arches National Parks

Sample text

It is set apart by large fault systems (long trends of earth fractures, sometimes called "lineaments") that are major breaks in a continental-scale structural fabric that dates back to the Precambrian Era, more than half a billion years ago. Within this large block of thick earth crust, the land has responded to numerous events of crustal unrest that have culminated in the rugged surface we see today. Hundreds of lesser deep-seated faults (fractures along which there has been some movement) have contributed to the formation of large uplifts and intervening down-folded basins in the rocks.

Faulting along the San Andreas fault system continues today, but otherwise it is almost identical to the Precambrian structures. deeply buried by younger rocks, but several thousand feet of slightly altered sandstone (quartzite) is present in both the Uinta and San Juan mountains. About 13,000 feet of sandstone and shale of this age are present in Grand Canyon. 5 billion years ago, long before Cambrian time, a continental-scale swarm of wrench faults cut northwestward through Canyonlands country.

The sand and gravel brought to the basins by streams were composed mostly of quartz, feldspar, and iron-bearing minerals such as augite and hornblende, because they were abundant in the parent rocks. '' The iron-bearing minerals easily decompose (basically they rust) to produce the red colors so obvious in the rocks of Canyonlands country today. Feldspar grains, the squarish gray or pink grains in granite, do not decompose as quickly, and form the pink grains of sand so characteristic of the Cutler Formation.

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