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
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