﻿Roukrtson : Icokots oh- Lkpanto. ] 



[Phil. Joitrn. Sci.. IX, D, No. 6. 



PLATE VI. OLD SPANISH ROAD TO COPPER MINES, MANCAYAN. SHOWING 

 CONTACT BETWEEN OVERLYING QUARTZ PORPHYRY AND MANCAYAN 

 DIORITE. 



