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horst

[hawrst] /hɔrst/
noun
1.
a portion of the earth's crust, bounded on at least two sides by faults, that has risen in relation to adjacent portions.
Compare graben.
Origin
1890-1895
1890-95; < German: thicket; cognate with hurst
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for horst

horst

/hɔːst/
noun
1.
a ridge of land that has been forced upwards between two parallel faults
Word Origin
C20: from German: thicket
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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horst in Science
horst
  (hôrst)   

A usually elongated block of rock that is bounded by parallel geologic faults along its two longest sides and has a higher elevation than the rock at its sides. Horsts form where rock is being compressed by tectonic forces.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for horst

elongate fault blocks of the Earth's crust that have been raised and lowered, respectively, relative to their surrounding areas as a direct effect of faulting. Horsts and grabens may range in size from blocks a few centimetres wide to tens of kilometres wide; the vertical movement may be up to several thousand feet. They are bounded on both sides by steeply dipping normal faults, along which movement has been essentially equal, resulting in blocks that are scarcely tilted. The faults forming horsts generally dip away from each other: those forming grabens generally dip toward each other. Two or more horsts and grabens may occur adjacently. They are thought to be due to lateral tension possibly produced by regional uplift or salt dome formation; they often occur on the crests of domes or anticlines. Valleys formed in grabens are commonly called rift valleys and may exhibit features of vulcanism often associated with graben formation. Examples of grabens are the Jordan-Dead Sea depression and Death Valley. The Vosges Mountains of France and the Palestine Plateau are typical horsts.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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