V. S. GEOLOnif'AI, SURVEY 



BULLETIN- 707 PLATE XL 



A. GRAND CANYON OF THE ARKANSAS BELOW TEXAS CREEK. 



Below Texas Creek the canyon in many places is very rough and rugged, tlic massive granite 

 projecting from the walls on either side seems almost to bar the i)athway of the river, and 

 these spurs are crowned with crags and iiiiinacles. Photograph by INIarius R. Campbell. 



B. TUNNEL ON RAINBOW HICHWAY. 



The construction of the Rainbow Highway involved engineering dillicullies as great as those which 

 beset the railroad engineers in 1881. Much rock cutting was done, and even tunnels were driven 

 through the projecting points of massive granite. Photograph by Marius R. Campbell. 



