coal seam

The reason taken for this new plan was to save the coal seam.

The coal seam itself is 6 to 8 feet thick.

Thus, where oil and gas deposits are found, there will often be coal seams above them.

The coal seam was thick, nearly two and a half meters.

The coal seams dipped at 1 to 4.5 towards the south.

There are also numerous coal seams within the sequence, most of which have been worked.

He proposes that the coal seams should be worked in the advance.

Coal seams visible on the surface are followed deep underground.

It gave us some of the thickest coal seams in America.

These were and are economically important coal seams in the Appalachian area.