Fire Clay Coal Zone Resource Areas in Virginia, Kentucky, and West Virginia

This dataset is a polygon coverage of the Fire Clay coal zone that represents
the areas in which resources were calculated and is only part of the full
outcrop of the coal zone. Parts of the boundaries of the resource areas represent
the 14-inch thickness isoline of the Fre Clay coal or the sub-crop limits of
data availability; other parts of the boundaries are actual outcrop.
The file has been generalized from detailed geologic coverages found
elsewhere in Professional Paper 1625-C.

This resource model for the Fire Clay coal zone must be considered
provisional, because the correlation of the zone continues to be
evaluated in West Virginia.