NO. 3 



SMITHSONIAN EXPLORATIONS, I915 



15 



tiG. 22.— Beautiful light cream-colored siiiceuu^ deposit in run-off from 

 Artemisia Geyser, about one-eighth natural size. Photographed looking down 

 into the hot water. The pebbly looking bottom is from 6 to 8 inches beneath 

 surface, and is formed by the deposit in very much the same manner as the 

 ripple deposits in Fig. 21. Photograph by Walcott. 



Fig. 23. — Yellowstone Canyon below Tower Falls Creek, showing two beauti- 

 ful bands of columnar basalt interbedded in the early basic breccia formed of 

 fragments of pyroxene-andesite, hornblende-andesite, and basalt associated 

 with basic lava flow. Photograph by Walcott. 



