CEOl.OGICAr. SURVEY 



GEOIjflGY OF l.EADVILLB PTjXXXM. 



Scalerl inch to 4- feet. 



SECTION OF FURNACE SHOWTNG 

 ZONES OF TEMPEHATUHE 



JuMusBienA In lull 



SMEIJTER G. 



;.F KniTiions. Geologjsi-in- flla 



