foot wall

footwall

[foot-wawl]
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:
1640–50; foot + wall

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
footwall (ˈfʊtˌwɔːl)
 
n
Compare hanging wall the rocks on the lower side of an inclined fault plane or mineral vein

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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