IRE JR RIG All ON AGE. 55 



formations of this section with special reference to the location of 

 underground waters which may be made available by well borings. 

 Greeley is situated in the arid eastern part of Colorado nnd was 

 founded through the efforts of Horace Greeley, who was one of the 

 early enthusiasts of the possibilities of irrigation. In Colorado as in 

 all the arid states where most of the streams run low in the snmmer 

 season, a reliable supply of well water is of great importance, often 

 being equivalent to the difference between profit and loss in the man- 

 agement of the farm. This 'is especially true of the smaller farms 

 where wells are used to assist in irrigation. An attempt will be made 

 to locate the underground waters of the Greeley district and to secure 

 all the information possible regarding their depth, volume and relia- 

 bility. 



The serious character of the recent July drouths which so jeop- 

 ardised the western crops gives an unusual interest to the investiga- 

 tions of the United States geological survey which are being con- 

 ducted in the Big Horn Mountains of Northern Wyoming. It is to 

 this section that the porous, water bearing rock formations come to 

 the surface which are known to underlie the whole of the great plains 

 region to the eastward, and from which are derived the very consid 1 

 erable artesian water supply which means so much to the industrial 

 and agricultural development of the section. Along the slopes of the 

 Big Horn Mountains, the Black Hills and other localities numerous 

 mountain streams flow across the upturned faces of these rock layers 

 and furnish water which slowly works its way along them under the 

 plains to the eastw;ird. In these mountain regions it is possible to 

 measure their thickness, study the character of the rock lying beneath 

 them, and obtain other information of value in throwing added light 

 on the important question of the water resourses of the great plains. 

 The work is being conducted by Mr. N. H. Darton, who has spent sev- 

 eral seasons in similar investigations. 



As the part of the general plan of the United States geological 

 survey for a comprehensive investigation of the underground water 

 resources of the great plains region, Prof. Charles M. Hall of the 

 Agricultural College at Pargo, N. D., will spend a portion of the sum- 

 mer in the study of the artesian waters of the upper Red River valley 

 and of the southeastern part of North Dakota. The wells of this re- 

 gion, which is an important agricultural center, have proved to be a 

 growing factor in increasing the possibilities of its further develop- 

 ment. The results of Prof. Hall's investigations will be published in 

 the series of interesting water supply papers issued by the govern^ 

 ment. 



