436 



KIRK BRYAN 



westerly and is underlain by the younger Stanley shale and overlain 

 by the older Arkansas novaculite. Obviously this body is the 

 overturned southeastern limb of the Hot Springs Mountain anti- 

 cline. Figure 5 is a cross-section of this part of the mountain 

 and shows the relation of this body of sandstone to the other rocks. 

 The relation of these two bodies of sandstone once a continu- 

 ous layer is somewhat uncertain because of the lack of outcrops 

 in the western part of the hospital grounds. If the two bodies are 

 continuous, an extremely close fold is necessary to bend the bed 



Fig. s. 

 water well. 



-Geologic cross-section on line CD, Figure 3, through proposed cold- 



from a position dipping 30° west at the superintendent's office 

 to 65° northwest near the reservoirs on the hospital grounds, 900 

 feet away. It seems likely that instead of bending, the beds broke 

 along a thrust fault and this interpretation is shown in Figures i 

 and 3. This postulated fault would have a plane which dips to the 

 northwest and a trend about 30° east of north. 



RELATION OF THE SPRINGS TO THE WESTERN 

 BODY OF SANDSTONE 



As shown in Figure 3, all the hot springs shown on maps since 

 1890 or now in existence emerge from the outcrop of the western 

 body of sandstone or from the immediately adjacent Stanley 

 shale. Similarly all the bodies of tufa which indicate the position 



