BULL. GEOL. SOC. AM 



VOL. 21, 1909, PL. ^' 



Figure 1. — The Edwin Natural Bridge, San Juan County, Utah 



Photograph of a painting hy H. L. A. Culmer. (See also text figure 4.) Height, 111 feet ; 

 205 feet ; width, 30 feet : thicliness of arch, 10 feet 



Figure 2. — The Augusta Sandstone Natural Bridge, San Juan County, Utah 



Photograph of a painting by H. L. A. Culmer. Fleight, 265 feet; span, 320 feet; thickness, 83 feet 



width, 35 feet 



ILLUSTRATIONS OF NATURAL ROCK BRIDGES 



