HOT WATER SUPPLY OF THE HOT SPRINGS 



431 



Hot Springs are located in the southern edge of one of these ranges 

 called the Zigzag Mountains, and on the northern border of a low- 

 land called the Mazern intermontane basin. 



The rocks of the Ouachita Mountains are nearly all of sedimen- 

 tary origin, but at Magnet Cove and Potash Sulphur Springs there 

 are small areas of igneous rocks and at numerous localities near by 

 there are small dikes. 



EXPLANATION 

 S E. D I M E.N TA R V 



Stanley shade Hot Springs sandstone Arkansas novaculite Missouri Mtn.shale 



•^ IGNE10U3 



Polk Cr. shale 



Bigfbrk chert 



* *t 



Dikes and sills 



Fig. I. — Geologic map of vicinity of Hot Springs, Arkansas, after Purdue 

 and Miser. 



The sedimentary rocks are indurated and hard, but are only 

 slightly affected by metamorphism. The maximum thickness 

 of the rock beds exposed in the Ouachita Mountains is 37,000 feet, 

 but only a fraction of this total is exposed in the vicinity of the 

 Springs. 



