What has been done to accommodate changes in stratigraphic nomenclature and contacts since the paper maps were published?
Nearly all the USGS-KGS 1:24,000-scale geologic quadrangle maps were printed by 1978. Some changes have been made to the stratigraphy of Kentucky since 1978. The changes, particularly in the coal fields, are the result of research done since the original maps were printed. The changes in stratigraphy are incorporated into the digital data sets to keep the geology of Kentucky as up to date as possible.
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- What has been done to accommodate changes in stratigraphic nomenclature and contacts since the paper maps were published?