Four geologic provinces along the east coast of Africa recently were assessed for undiscovered, technically recoverable oil,  natural gas, and natural gas liquids resources as part of the U.S. Geological Survey’s (USGS) World Oil and Gas Assessment.  Using a geology-based assessment methodology, the USGS estimated mean volumes of 27.6 billion barrels of oil, 441.1 trillion  cubic feet of natural gas, and 13.77 billion barrels of natural gas liquids.