This service uses two geologic base maps; the 1:500,000-scale geologic map of Kentucky at scales

smaller than 1:100,000, and 1:24,000-scale geological quadrangle data at larger scales.

The 1:500,000-scale geologic map data were derived from the 1988 Geologic Map of Kentucky, which was compiled

by Martin C. Noger (KGS) from the 1981 Geologic Map of Kentucky (Scale 1:250,000) by McDowell and others (USGS).

The 1:24,000-scale geologic map data and the fault data were compiled from 707 Geological Survey 7.5-minute geologic quadrangle maps,

which were digitized during the Kentucky Geological Survey Digital Mapping Program (1996-2006).