U. S. GEOLOGICAL SURVEY 



BULLETIN' 707 PLATE XX 



A. THE "SIAMESE TWINS. " 



The "Siamese Twins" are still apparently bound together by solid rock, but close inspection 

 shows a crack along which the weather is slowly accomplishing its work of destruction. A 

 few grains of sand may be loosened and blown away each day, and thLs process repeated 

 almost indelinilely will hn;illy sever the coiniectioii and then the columns will stand separate 

 and distinct. I'hotoi:raph by L. C. IMcChire. Denver: furnished by tlie Denver & Rio 

 Granilo Western Railroad. 



B. "BALANCED ROCK." 



This strange monument of nature's handiwork attracts the attention of most travelers. It 

 was once doubtless connected with the pedestal on which it stands, but a soft layer near the 

 bottom has been worn away until the mass seems to be ready to tumble at any moment. The 

 red sandstone contains many pebbles and might properly be called a conglomerate. Pho- 

 tograph furnished by the Denver & Rio Grande Western Railroad. 



