Water Supply and Irrigation Papers of the United States Geological Survey . ws&?. B. LIGNITIC BEDS AT SOUTH END OF NORTH CAVE HILL BUTTE COUNTY, S. 5-1 te near base. (Photograph by J. E. Todi GEOLOGY OF NORTHWESTERN SOUTH DAKOTA. 31 souri River in the vicinity of Medora, N. Dak. Knowlton andPeale believe that the latter are of Fort Union age, and the lignite-bearing beds of South Dakota arc presumably of the same age. POST-EOCENE. Outliers of Tertiary deposits cap a number of high buttes onthe divides between the Belle Fourche, Owl, Grand, and LittleMissouri valleys. The most notabl
Water Supply and Irrigation Papers of the United States Geological Survey . ws&?. B. LIGNITIC BEDS AT SOUTH END OF NORTH CAVE HILL BUTTE COUNTY, S. 5-1 te near base. (Photograph by J. E. Todi GEOLOGY OF NORTHWESTERN SOUTH DAKOTA. 31 souri River in the vicinity of Medora, N. Dak. Knowlton andPeale believe that the latter are of Fort Union age, and the lignite-bearing beds of South Dakota arc presumably of the same age. POST-EOCENE. Outliers of Tertiary deposits cap a number of high buttes onthe divides between the Belle Fourche, Owl, Grand, and LittleMissouri valleys. The most notable of these features are CastleRock, Haystack, Slim, and Deers Ears buttes, and Cave and ShortPine hills. These hills rise several hundred feet from the rollingprairie of the lignite-bearing formation, which varies in altitudefrom about 3,000 to 3,500 feet. The deposits lie unconformably onthat formation, and appear to belong largely to the White Rivergroup. In Slim Buttes and the Short Pine Hills they are capped bybeds which are described by Todd as Loup Fork, but which should
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