. Annual report of the United States Geological Survey to the Secretary of the Interior . ! LUNO/S HILL.] THE BLACK PRAIRIE. 65 laterals and sublaterals are dry except in times of rainfall, when theycarry off the surface water. The stream valleys of the through-flowing rivers and of the maintrunks of the prairie rivers in their lower portion are accompanied byold alluvial formations, often of considerable width and extent, asmore fully discussed in the geologic part of this paper. In addition to the types of streams mentioned, the Indian Territoryextension of the Red River subdivision of the C
. Annual report of the United States Geological Survey to the Secretary of the Interior . ! LUNO/S HILL.] THE BLACK PRAIRIE. 65 laterals and sublaterals are dry except in times of rainfall, when theycarry off the surface water. The stream valleys of the through-flowing rivers and of the maintrunks of the prairie rivers in their lower portion are accompanied byold alluvial formations, often of considerable width and extent, asmore fully discussed in the geologic part of this paper. In addition to the types of streams mentioned, the Indian Territoryextension of the Red River subdivision of the Cretaceous prairies iscrossed from north to south by a number of deep and copious lateralsof Red River, which originate in the Ouachita Mountains, includingthe Little, Kiamitia, Boggy, Blue, and Washita rivers. Furthermore,Red River itself, instead of flowing across the strike of the differentbelts, as do the Brazos and the Colorado, first follows the Red Riverfault zone to the east edge of Grayson County and then practicallyfollows the strike of the Eastern Cross Timber belt until it
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