﻿528 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



SUCCESSION OF BED ROCKS. 



[Pleistocene, i llllli llili llll li- 



fe. River alluTium. 

 ■jb. Muds and sUts. 

 |a. Gravel. 



Toro 1 

 ^^' Jimestone. /''"^^" "'^""^ ^^'^ limestone. 



• JLight colored tuff beds, argillite, etc. 



nifiin f^- Clay beds. 

 >,i<ii,un p., -c^^, „ J, 



Sliocene. ■ 



Panama, 

 formation. 



■■•■•■■■li 



formation. 



b. Fine sandstone. 

 ,a. Argillite. 



OHgoccne. ■ 



u-umito 1^- f^andstone. 

 '■ formation. ^: s^i-/,tZ|'°""'*^- 



Caimito 



^- fimestonr j^arine limestone, many corals. 



la ^ 



VLand formed clay rocks, lava flow, etc. 



j- Marine carbonaceous shale, clay, tuffs, limy sandstone. 



Cucuracha 

 formation. 



Culebra 

 formation. 



go ° o!^° ^ / 3. con4oinerate K'oarse and fine conglomerate and sandstone beds. 



iKocene? 





2 Las Cascadas Wolcanic debris, mud-lava, some flows and dikes 6f 

 agglomerate. / andesite. 



1- SS^h'-^^t---- 



SUCCESSION or IGNEOUS ROCKS. 

 6. Basalt. 



: 5. Meta-brcccia. 



<?) 





wy. 



4. Rhvolitc. 



3. Andesite. 



2. Dioritc. 



1. Grandiorite. 



J-'iG. 2f'>— Rock succession in the Canal Zone. (From U. S. Bureau of Mines Bull. S6.) 



