Mining. the top of the rock stratum underlying a vein or bed of ore. Compare hanging wall ( def 1 ).
Geology. a mass of rock lying beneath a fault plane.

1640–50; foot + wall Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
footwall (ˈfʊtˌwɔːl)
Compare hanging wall the rocks on the lower side of an inclined fault plane or mineral vein

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
footwall   (ft'wôl')  Pronunciation Key 
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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Example sentences
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.
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