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Rocks of White River (Oligocene) age have been known for many years to constitute numerous isolated buttes and mesas in the northwest corner of South Dakota, but no detailed study of their character and structural relations had been made until 1911, when, during an examination of the lignite area of that country, the writer had occasion to study the relation of the younger rocks to those containing lignite beds. Todd,' in 1895, recognized the White River formation in the Slim Buttes and called attention to the area in the following language:

Cross-Bedding in the White River Formation of Northwestern South Dakota