field hockey | oil | Field Marshal | Boulder, Colorado | Standard Oil | Field Museum of Natural History | Gulf Oil | Deepwater Horizon oil spill | Wrigley Field | Shell Oil Company | Midnight Oil | 1973 oil crisis | oil refinery | Boulder | Soldier Field | Sally Field | oil painting | Field of Dreams | Ebbets Field | Oil platform | Castor oil plant | Oil Campaign of World War II | Royal Field Artillery | Eugene Field | United States high school national records in track and field | Marshall Field's | field marshal | England national field hockey team | oil platform | North Sea oil |
Oil and gas have been produced from the Denver Basin since the discovery in 1901 of oil in fractured Pierre Shale at the McKenzie Well, part of the Boulder oil field in Boulder County.