Major deposits of natural, bituminous, quartz sandstone (Kentucky Rock Asphalt) occur in six counties of western Kentucky and a few minor deposits occur in eastern Kentucky. Crushed rock asphalt has been used extensively in Kentucky and elsewhere for over 50 years for surfacing roads.* The most productive area was in Edmonson County where the Caseyville and Bee Springs formations were quarried and mined. These deposits have been described as oil-pools which are now defunct and from which only the asphaltic residue remains. The bitumen content of the rock varies locally in a quarry or mine; and, because of this, enormous quantities of lean rock asphalt (containing up to seven percent bitumen) were wasted as tailings in obtaining material having a higher bitumen content.
Digital Object Identifier
Laughlin, George R., "Construction Report on Experimental Use of Natural, Bituminous, Quartz Sandstone (Kentucky Rock Asphalt) as a Traffic-Bound Aggregate" (1962). Kentucky Transportation Center Research Report. 1184.