Objective is to demonstrate the technical feasibility of using superheated steam as a heat-carrying medium to retort in situ the oil shale in the Green River Formation leached zone and provide a mechanism for the recovery of this shale oil with a minimum impact on the environment. Utilizing primarily the natural porosity in the leached zone, approximately one trillion Btu of heat will be injected into a site over a two-year period to heat to retorting temperature a shale zone approximately 550 feet thick and covering about one acre. The field Project is located at Equity's BX In Situ site in Rio Blanco County in northwestern Colorado. The quarter June to August 1980, was the first quarter since Project start up that sustained steam injection at superheated temperatures has taken place. Results of the injection for the quarter have been positively reflected in temperature observation wells, and, although mechanical problems with Project equipment still exist, Project goals are being met.