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footwall

[foo t-wawl] /ˈfʊtˌwɔl/
noun
1.
Mining. the top of the rock stratum underlying a vein or bed of ore.
Compare hanging wall (def 1).
2.
Geology. a mass of rock lying beneath a fault plane.
Origin
1640-1650
1640-50; foot + wall
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for footwall
  • If the fault surface is exposed, the footwall is the side onto which water would drip.
  • Sulfides may intrude fractures in footwall country rock.
  • Ingress of sulfur through fractures in footwall may be important ore control.
  • footwall rocks are highly oxidized, sheared, and cut by anastomosing quartz-sulfide veinlets.
  • The color shows the amplitude of dislocations and white arrows represent the motion of the hanging wall relative to the footwall.
  • The colors show the slip amplitude and white arrows indicate the direction of motion of the hanging wall relative to the footwall.
  • The section south of the fault is the footwall and the northern part is the hanging wall.
  • Cordierite and anthophyllite in footwall of metamorphosed deposits, graphitic schist in hanging wall.
  • Surface location of a fault in which the hanging wall has moved downward relative to the footwall.
  • Both the hanging wall and footwall must be strong, since there is no support in the slopes.
British Dictionary definitions for footwall

footwall

/ˈfʊtˌwɔːl/
noun
1.
the rocks on the lower side of an inclined fault plane or mineral vein Compare hanging wall
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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footwall in Science
footwall
  (ft'wôl')   
The block of rock lying under an inclined geologic fault plane. See more at fault. Compare hanging wall.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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14
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