364 



Feet 

 i,ooo± 



500+ 

 500+ 



2,500 



900+ 



600 

 300 

 650 { 



2,200 



400 

 950 



1,600+ ■ 



i,ooo± 

 i,ooo± 



1,500 

 500 



5,000+ 



III 



J L 



J L 



I I ! t 



I 1 I 



r~ri 



J-O— I 



EZEZTi 



FRANCIS PARKER SHEPARD 



Massive limestone Mississipian 



Thin-bedded limestone and shale 

 Quartzite 



" Upper Devonian 



1.1' 



i >^^ 



J L 



J L 



1 I . 



J L 



Massive limestone 



Calcareous shales 



Massive limestone crystalline 



Bowlder bed 



Fairly massive gray limestone 



Massive limestone, gray and black " 



Silurian or Devonian 



Sandstone and quartzite 

 Massive limestone 



Upper Richmond 

 Lower Richmond 

 Thin-bedded limestone and shales Lowest Ordovician 



rWr^ 



Shales and thin-bedded limestone 

 Massive pink weathered limestone 



Thin-bedded limestone 



Massive gray and black limestone 

 The Clastic Series 



Conglomerates, sandstones 



Shales, and schists 



Upper Cambrian 



Upper or Middle 

 Cambrian 



Cambrian and 

 Pre-Cambrian 



Fig. 2. — Generalized section along the Rocky Mountain trench 



