HOT WATER SUPPLY OF THE HOT SPRINGS 



435 



to the Arlington Hotel and then swings in a broader north and 

 south belt to Reserve Avenue. In this broader belt it has a dip 

 of about 30° and the contact with the overlying Stanley shale is 

 well displayed in the basement of the Maurice, Fordyce, and 

 "new" bathhouses. The lower contact of this body of Hot 

 Springs sandstone extends along the hillside above the springs 

 from the vicinity of the nurses' dormitory in the hospital grounds 

 northwest. In general this contact can be located within 25 feet. 

 South of Reserve Avenue there are no outcrops of the sandstone, 

 nor are there any in the western part of the hospital grounds. 



ARMY AND NAVY HOSPIJAL TANK 



CENTRAL 



AVE , 

 EL. 60O 



Fig. 4. —Geologic cross-section on line AB, Figure 3, through Fordyce well 



Since the sandstone is hard and commonly produces outcrops it 

 is assumed that the sandstone does not extend southward any 

 appreciable distance beyond the park line. 



This western body of sandstone is the northwestern limb of the 

 Hot Springs Mountain anticline which in its extension along Bath- 

 house Row forms the nose of the plunging structure. Figure 4 

 is the cross-section of this part of the mountain on the line AB 

 which shows the relation of this body of sandstone to the other 

 rocks. 



A second body of Hot Springs sandstone begins on the southeast 

 flank of Hot Springs Mountain and extends southwesterly within 

 the hospital grounds. This eastern body of sandstone dips north- 



