THE CENTRAL 



GREAT PLAINS 



THE United States Geological 

 Survey has for a number of 

 years been studying the under- 

 ground waters which are flowing hun- 

 dreds of feet beneath the surface in 

 many sections of the Central Great 

 Plains, including the greater portions 

 of South Dakota, Nebraska, and Kan- 

 sas and the eastern portion of Colo- 

 rado and of Wyoming, an area of about 

 one-half million square miles. In order 



that we may make the best possible use 

 of the underground " rivers " which it 

 it is believed flow perhaps continuously 

 for some hundreds of miles, it is neces- 

 sary to understand the structure and 

 stratigraphy of the water-bearing for- 

 mations. 



The question of water supply, both 

 overground and underground, is one of 

 great interest to the people in this dis- 

 trict, and although considerable progress 



From N. H. Darton, U. S. Geological Survey 



Artesian Well at Woonsocket, South Dakota 

 This well throws a 3-inch stream to a height of 97 feet 



