﻿U. S. NATIONAL MUSEUM 



| [ : >v. «^ 



BULLETIN 103 PLATE 153 



.c^rtdTh^f '^"'-'-^kW^AS," :}te«^?"'*. 



By Donald F. MacDonald. 

 ase map by 



Isthmian Canal Commission 



GENERALIZED GEOLOGIC MAP OF THE CANAL ZONE 



TERTIARY 



Osc 



Tis 



1111)3 a 

 coibI flats limestone 



I'lcistocenf PHocevc 



Gatiin Caiiuilo 



formation sairdstoiie, 



tufls, eto. 



Emperador (ulebiaaii.i Bolilo eonglo- Basalt and Rhyolite 



iiiuestone t ucuraclia nmiatc and andesite 



shales. tuHV. sandstone , 

 and elav rocks 



Miocene 



Oligocene 



Miocene t 



Igneous eomplcx — gnino. 

 diorite. nietabreccia, I-aB 

 Tascadas aggloinernti-. Has 

 Obispo breecia, old lutft 

 (includes small areas of 

 many of the other lornia- 

 tions) 



