U. S. NATIONAL MUSEUM 



BULLETIN 103 PLATE 153 



' Donald F. MacDonald. 

 Base map by 



Isthmian Canal Commiss 



GENERALIZED GEOLOGIC MAP OF THE CANAL ZONE 



TERTIARY 



Pleistocene pu c 



Tpt 





T* 



Caimito 

 sairdstoue, 

 tuffs, etc. 



Tels 



Pan urns 

 lulls 







Gatun 

 formation 



Emperador 

 limestone 





i 



Hoc 



sne 





01 



rb 



CuJcura and Bohio conglo- Basalt and 



('ueuracha merate and andesite 



shales, tiiffs, sandstone i 



and clay rocks , 



Ign 



plex — grano- 



;r»te, Baa 

 old lulls 



diorite, met a breccia, I 

 / Oascadas aggl 



Obispo breccia, 

 (includes small 

 many of the other forma 

 tions) 



of 



