The material now called Gilsonite, natural bitumen, mineral bitumen, mineral tar, mineral pitch, bituminous rock asphalt, natural asphalt, Asphaltite, Asfaltite which was discovered in the Kermanshah since 1970.

Modern geologists believe that the origin of Gilsonite is linked to the rich oil shale of the Green River Formation that underlies much of the basin. Deep vertical fissures in the earth's surface were once filled with a heavy, viscous hydrocarbon that lost its volatile constituents and solidified millions of years ago.

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