U. s. r.E(iT,nr,icAL survey 



rROFRSSlnNAI, PAPER P2n PT.ATE XI, I 



A. IIIIXS OF CHLOHITIC SCHIST AT THE NOKTH END OF THE BIG HOIIN MOUNTAINS 

 WEAK THEI'ALO VERDE MINE. MAIUCOPA COUNTY, AlllZ. 



V 





V «■ •' - '■*- -jt.. ■^»*'' 



U. GONZALES WELI.S. DOME HOCR MOUNTAINS, YUMA COUNTY, AIllZ. 

 The moUMlaius iu llic buckcrouud sliuw tlie lypiual appear.'inuc ol' roL-ks of tlic basal coujijlcx. 



1 



