This database contains data collected by KGS during field projects or compiled from reports prepared by other companies or agencies. The data in eastern Kentucky were primarily collected from roadcuts, natural outcrops, and coal mines and consist of single-point measurements of coal thickness. Some data in eastern Kentucky have been summarized from borehole records. The data in western Kentucky were primarily obtained from borehole records due to the lack of surface exposures. Therefore, duplicate information exists for western Kentucky data in the thickness database and the borehole database. Thickness records are downloadable and include county, quadrangle, coal bed name, total coal thickness (coal only, inches), total parting thickness (if measured, inches), elevation (feet--relative to sea level), coal modifier (if available), exposure type, and location in coordinates (in UTM, State Plane, and Latitude/Longitude). Coal elevations reference the base of the seam and most were determined by altimeter. Coal bed names were assigned by field personnel during mapping; however, the user should use independent means to verify these results. While the staff of the KGS has made every effort to ensure that the data reflects information on file, the Kentucky Geological Survey makes no warranty, expressed or implied, concerning the accuracy or validity of these data. The user assumes all liability for any losses or damages that may be incurred through any use or application of these data. Users are requested to notify KGS upon discovery of any errors in the data supplied.