UINTAITE Mastic Asphalt is an excellent natural bituminous material, which can improve the performance of asphalt pavement when mixed with conventional asphalt mixture.
Then, among this basaltic rock, there snaked long, hardened lava flows inlaid with veins of bituminous coal and in places covered by wide carpets of sulfur.
Enormous fields of bituminous lay in those Appalachian ranges extending from Pennsylvania to Alabama, in Michigan, in the Rocky Mountains, and in the Pacific regions.