Origin of coal field
Examples from the Web for coalfield
In Hyderabad it includes the important Singareni coalfield, but in the Presidency no good coal seams have yet been found.
On a collection of insect-remains from the South Wales coalfield.The Biotic Associations of Cockroaches|Louis M. Roth
In this respect also one coalfield differs greatly from another.Supply and Demand|Hubert D. Henderson
Upon these rocks the coalfield of Whitehaven rests and extends as far as Maryport.
Toward the last we had seen evidences of the great La Plata coalfield, to which I must devote a paragraph.The Crest of the Continent|Ernest Ingersoll