Within the past 6 years 17 gas fields, of which 14 are now producing, have been discovered in western Kansas, exclusive of those in the southwestern part of the state. A number of the fields are only in early stages of development and data for delineation of subsurface structure are consequently meager. The gas-producing horizons range stratigraphically from the uppermost part of the “Mississippi lime” to strata of Lower Permian age, the most prolific being the zone adjacent to the unconformity between the Mississippian and Pennsylvanian systems. The source of the gas is thought to be the carbonaceous beds occurring in the predominately shaly lower part of the Pennsylvanian system as found within the area. Total production of all the fields to the end of 1931 amounted to 38 billion cubic feet of gas.