Meaning of footwall

foot•wall

Pronunciation: (foot'wôl"), [key]
— n.
  1. the top of the rock stratum underlying a vein or bed of ore. Cf. hanging wall (def. 1).
  2. a mass of rock lying beneath a fault plane.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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