Excerpt from Selected Annotated Bibliography on Asphalt-Bearing Rocks of the United States and Canada, to 1970: A Compilation of About 600 Selected References Pertaining to the Geology and Occurrence of Asphalt-Bearing Rocks
Asphalt-bearing deposits most commonly occur around the margins of oil-producing basins in which the oil-containing for mations are near the surface. The locations of many of the early discovery oil wells were on or near outcrops of asphalt-bearing rocks. Asphalt deposits also occur within the basins where folds and faults have brought these asphalt-bearing formations to the surface. Prior to production of petroleum from wells, such de posits were mined for recovery of petroleum products and for road material. A few asphalt-bearing rocks are being mined at the present time for the asphalt; however, 90 percent of the asphalt used in the United States is produced from the refining of crude petroleum.
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