Accompanied by 2 foldouts. Fig. 1 : Geologic section extending in northeast-southwest direction through Panola County. Fig. 2 : Contour map, sea level datum. Contours at base of the Annona formation. Contour interval, 500 feet. University of Texas bulletin ; no. 2232 : Aug. 22, 1922."Bureau of Economic Geology and Technology, Division of Economic Geology."