Wiktionary
coal seam
n. (context geology English) A stratum of coal between strata of other rocks.
WordNet
coal seam
n. a seam of coal
Usage examples of "coal seam".
In 1962, a fire in a dump on the edge of town ignited a coal seam.
Roger demanded, gesturing at the coal seam, and Cord snapped his fingers again in a Mardukan sign of agreement.
A few thousan people maybe, an a lot of them was out of work account of the coal seam that caused the town to be there in the first place had done played out.
Rage burned permanently in her eyes like a fire in a coal seam, underground and unquenchable.
If you feel bad, ask Joel Chenge about the boots he tried to lay down in a coal seam.