^MAMMOTH 

 * % HOT SPRINGS 



A NORRIS GRAND 

 JL " GEYSER 



OUTER EDGE 

 OF MAIN RIM 

 FRACTURES .*'f' 



RESURGENT 

 DOME 



CALDERA 

 RIM* 



Figure 2. Map of Yellowstone National Park showing the extent of 

 the Yellowstone Caldera and the resurgent domes near 

 Old Faithful and Le Hardy Rapids. Areas of geothermal 

 activity are shown in black (after Smith and 

 Christiansen 1980). Yellowstone Lake lies within 

 this active region. 



84 



