a bed of coal.
Origin of coal seam
First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for coal seam
Historical Examples of coal seam
The mining engineer, Monsieur Arnaud, was of opinion that on sinking deeper into the coal-seam a better quality would be met with.Cruise of the 'Alert'
R. W. Coppinger