Publisher's Synopsis
Excerpt from Hand Book of Kentucky
The different formation from the coal measures downward were worn through in succession and their margins retreated outward from this region as a center in ever-widening concentric bands like the coats of an onion as it is pared away.
A result of this has been in some cases at least, an increase in surface area of older formations at the expense of the newer. The coal measure area of Kentucky, for instance, has been steadily wasting away until from once having covered all or nearly all of the State, it has now been reduced to square miles and cut into two fields, an Eastern and a Western.
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