During the year 1940, the north and west-central Texas districts developed important new production in the following stratigraphic formations.

Ellenburger limestone (Cambro-Ordovician) in the western part of the K.M.A. field in Wichita County.

Chappel limestone (Mississippian) in two pools on the Bend arch in Young County and in one pool on the eastern edge of the Permian basin in Stonewall County.

Bend conglomerate in one pool in Clay County, and in one pool in Montague County, both in the Forth Worth syncline.

Caddo limestone (Bend) in two pools on the Bend arch in Archer County, and in three pools in the Fort Worth syncline, two of them in Clay County and one in Montague County.

Strawn series (Pennsylvanian) in two pools on the Bend arch in Archer County, and in one pool on the east flank of the Bend arch in Clay County.

Canyon series (Pennsylvanian) in two pools on the west flank of the Bend arch in Baylor County, in one pool in Jones County, in one pool on the Electra arch in Foard County, and in one pool in Wilbarger County in the Red River syncline.

Cisco series (Pennsylvanian) in practically every producing county in the area, the most significant of which was probably in the Fargo pool in the Red River syncline in Wilbarger County.

Probably the only new stratigraphic discovery in the area was the tentative identification of Viola limestone (Ordovician) in two of the deeper wells in Clay County and in two in Montague County, and in one in Wise County, all in the Fort Worth syncline.

Total production for north and west-central Texas for 1940 was 49,221,930 barrels.