coal seam

noun
a bed of coal.

Origin:
1840–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To coal seam
Example sentences
The change, he said, could have come from miners digging deeper into a coal
  seam.
It presents an equation for calculating the stress field in a coal seam
  adjacent to an excavation.
Thus, the nature of the coal seam itself is an important variable to be
  considered.
Surface coal mine operators frequently have to loosen the rock above the coal
  seam.
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