Map and Chart--KGS


This chart is one of a series that shows the regional characteristics of the Upper Elkhorn No. 3 coal zone. The maps and charts were prepared as part of the U.S. Geological Survey's National Coal Assessment Program, which compiles regional maps and databases that provide a comprehensive assessment of the most important coal beds in the nation. The Upper Elkhorn No. 3 coal zone has been one of the leading producers in the state of Kentucky and, in some areas, is of very high quality. Bed stratigraphy within the Upper Elkhorn No. 3 zone and thickness of the No. 3A coal are described in KGS Map and Chart Series 7-8 (series 12). This chart shows original total coal thickness (Fig. 1), mined-out areas (Fig. 2), mining facies (Fig. 3), and resource calculations (Fig. 4) for the Upper Elkhorn No. 3B coal (also know as the Darby or "C" seam south of the Pine Mountain Overthrust Fault). The coal-thickness map is not a traditional isopach map, because the mineable bed is not composed of the same benches in all areas (Fig. 3). Discontinuities, delineated by facies boundaries on the map, indicate abrupt changes in thickness caused by splitting; discontinuities also occur between areas where entirely different beds in the Upper Elkhorn No. 3 zone are favored for mining.

Publication Date



Series XII

Report Number

Map and Chart 9

Digital Object Identifier (DOI)


© 2000, by the University of Kentucky, Kentucky Geological Survey

Funding Information

This work was supported in part by grants from the U.S. Geological Survey's Coal Availability and National Coal Assessment Programs.

Related Content

A list of publications that relate to the Upper Elkhorn No. 3 coal zone can be found on the KGS Web site at

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