hanging wall

Mining. the underside of the wall rock overlying a vein or bed of ore. Compare footwall ( def 1 ).
Geology. a mass of rock overhanging a fault plane.


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World English Dictionary
hanging wall
Compare footwall the rocks on the upper side of an inclined fault plane or mineral vein

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hanging wall  
The block of rock lying above an inclined geologic fault plane. See more at fault. Compare footwall.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But, upon reopening the extruded surface would simply being a hanging wall,
  with nothing between it and the original block.
The changes only affect a limited area along the hanging wall of thrust or
  reverse faults.
Cordierite and anthophyllite in footwall of metamorphosed deposits, graphitic
  schist in hanging wall.
The colors show the slip amplitude and white arrows indicate the direction of
  motion of the hanging wall relative to the footwall.
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