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File:Lewis overthrust fault nh10f.jpg

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描述

schematic illustration of the Lewis overthrust fault in northern Montana, USA and Southern Alberta, Canada. The fault can be seen best in Glacier National Park, USA and Waterton Lakes National Park, Canada.

original caption: Overthrust Mountains

1 A hypothetical block of the Earth's crust in the region of Glacier National Park as it existed more than 60 million years ago. The two layers shown actually represent many strata of sedimentary rocks.

2 Lateral pressure begins to force the rock layers to buckle.

3 A large fold has been created, forcing the rock strata to double over and overturning some layers. A break, or fault, is forming at the plane of greatest stress.

4 The break has been completed and the strata west of the fault have slid eastward, up and over the rocks east of the fault.

5 The Glacier landscape today. Throughout the millions of years during which the folding, faulting, and overthrusting have been taking place, the process of erosion has continued; a thousand meters of stratified rocks have been worn away, so that only a remnant of the overthrust layers can be seen today. Because Glacier's eastern slope represents the eroded face of the overthrust block, the mountain range rises precipitously from the prairie, with no foothills breaking the abrupt transition from open prairie to mountain valley.
日期
来源 National Park Service http://www.nps.gov/history/history/online_books/natural/10/images/nh10f.jpg - used in the online edition of the book "MANY-STORIED MOUNTAINS - The Life of Glacier National Park" by Greg Beaumont, first published 1978 and online at http://www.nps.gov/history/history/online_books/natural/10/nh10b1.htm
作者 Greg Beaumont, National Park Service
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(二次使用本文件)
Public domain 该图片或媒体为美国国家公园管理局雇员在执行公务时创建。作为美国联邦政府的作品,此作品在美国境内属于公有领域。更多信息请参考美国国家公园管理局网站美国国家公园管理局版权政策

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当前2009年3月9日 (一) 21:582009年3月9日 (一) 21:58版本的缩略图1,400 × 870(71 KB)H-stt{{Information |Description= schematic illustration of the Lewis overthrust fault in northern Montana, USA and Southern Alberta, Canada. The fault can be seen best in Glacier National Park, USA and Waterton Lakes National Park, Canada. original caption: O

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