124 Hillebrand and Ransome — Carnotite and Associated 



colored sandstone becomes dark olive-green, the contrast being 

 most marked when the cliffs are wet. Although fairly con- 

 tinuous for the distance stated, this zone of vanadiferous sand- 

 stone is by no means regular. It varies much in thickness, and 

 in one place splits into two or more branches. At some points 

 two or more distinct streaks of roscoelite-bearing sand were 

 found at different horizons in the main sandstone bed. The 

 carnotite is not nearly so abundant as the roscoelite at this 

 locality. It occurs as minute yellow specks in the sandstone, 

 and particularly as thin horizontal seams or streaks near the 

 bottom of the vanadiferous zone. 



The work thus far done on the several claims which have 

 been located along these deposits is of the most superficial 

 character. On the Canary claim a tunnel of about 18 feet has 

 been run by Mr. A. B. Frenzel which exposes a typical sec- 

 tion of the impregnated zone (fig. 2). The roof of the tunnel 

 is formed by the underside of the bed of dark limestone previ- 

 ously referred to. This limestone is underlain by a few inches 

 of sandy limestone which passes into the light-buff La Plata 

 sandstone without break. The latter contains abundant calcite 



