Abstract
The eastern coalfield of Kentucky contains two horizons of workable refractory clays. One of these bearing flint, semi-flint and plastic clay is definitely proven to be of upper Pottsville age, and rests unconformably on the Mississippian formations. The other found in Boyd and eastern Carter County is in the Allegheny series and carries plastic fire clay of less commercial value. A number of points, not hitherto emphasized or noted are described.
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