It was found in natural deposits and by processing it became a refined product .
Much of California 's early oil discoveries were in the form of asphalt also known as bitumen a sticky , black and highly viscous liquid or semi-solid form of petroleum .
California was found in natural deposits and by processing California became a refined product .
Much of California 's early oil discoveries were in the form of asphalt also known as bitumen a sticky , black and highly viscous liquid or semi-solid form of petroleum .