Is the common name of a series of rock oils found in large quantities in the United States and Canada, near Rangoon, and in the neighbourhood of the Caspian Sea. The oil issues from the rocks, or is drawn from subterranean reservoirs, where its presence is supposed to result from natural distillation of vegetable and animal substances, and after refining, put in the market as benzoline, paraffin, and lubricating oil. It is extensively used in the industries, and has been applied as fuel to steamships.