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.
Baker & McKenzie | McKenzie Westmore | Reggie McKenzie (linebacker) | Reggie McKenzie | Julia McKenzie | Bret McKenzie | Scott McKenzie | Raleigh McKenzie | McKenzie Bridge, Oregon | McKenzie Bridge | Graham McKenzie | Fred McKenzie | Duke McKenzie | Clinton McKenzie | Barry McKenzie Holds His Own | Sally McKenzie | McKenzie, Maryland | Matt McKenzie | John McKenzie | Jacqueline McKenzie | Fay McKenzie | Desmond McKenzie | Daniel Duncan McKenzie | Alexander McKenzie Ross | The Adventures of Barry McKenzie | Steve McKenzie | Reggie McKenzie (guard) | Queenie McKenzie | Parker McKenzie | Neil McKenzie |