494 J. LeConte—Mineral Vein Formation. 
Arr. XLIL—On Mineral Vein formation now in progress at 
Steamboat Springs compared with the same at Sulphur Bank ; 
by JosEPH LECONTE. 
formed by deposit from the water. The mounds, however, run 
‘ It forms here, in fact, a 
shell-like deposit, firm, hard, and ringing under the 
lies against the slope of the western hill and reaches to neat 
the bottom of the valley. (Fig. 1. 
* Laur, Annales des Mines, for 1863, p. 423. Phillips, Phil. Mag, 1871, vol 
xiii, p. 401. . 
