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- See dome.
Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- A natural depression of strata containing a coalbed or other stratified deposit. CF: depression
- The lowest part of a mine or area of coal lands. Hudson
- A general region with an overall history of subsidence and thick sedimentary section. Wheeler, R.R.
Source: Dictionary of Mining, Mineral, and Related Terms