AMERICAN JOURNAL OF SCIENCE, V OL. XL1, 1916, PLATE I 



i 



THE PERUVIAN EXPEDITION OF 1912 

 YALE UNIVERSITY AND THE NATIONAL GEOGRAPHIC SOCIETY 



RECONNAISANCE GEOLOGIC MAP 



OF 



CUZCO VALLEY 



PERU 









Geology by Herbesr-t E Gregorj 

 Osgood Hardy and Joseph Prescott Little, 



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