412 



A. HYATT — TRIAS AND JURA IN THE WESTERN STATES. 





Lower 

 Jura. 



Middle 

 Jura. 



Upper Jura. 





5-1 



o 



3 

 ft 



a 



a5 



•r-l 



'o 



O 



5-1 



o 

 *s 



^4-1 



hi 



a5 

 O 



5h 

 CO 

 Oa 

 ft 



Callovian or Kel- 

 loway. 



1 



X 



o 



o 



X 

 O 



1 

 o 

 O 



Kimmeridgian or 

 Kimmeridge. 



• 1— 1 



O 



Inyo county, California 



* 

 * 



■5^ 



* 



^ 

 * 

 * 



* 



* 





Esmeralda county, Nevada 



S. W. part, Star Peak range, Nevada. 



Esmeralda county, Nevada 





Taylorville, California 







Beaver creek, Oregon 







Taylorville, California 







Canyon of the Yellowstone 









Taylorville, California 









Black hills, Dakota 













Red Buttes, North Platte 















Aurora, AVyoming 















Taylorville, California 















Mariposa basin 













* 





U ii 















(( ii 



















Colfax basin 









































Relative Age of the Rogks of different J^ocalities. 



In order to place the relative age of the rocks in different localities 

 in what I regard provisionally as their correct order, I have prepared 

 the following tabulated view of the Trias and Jura : 



Trias. 

 Aspen mountains, Idaho, near Soda springs. { ^^^^^^^^'^^^^^ °^ ^^^'^P^ (Bunter- 



Star Peak range (northern part) ^ 



New pass, Desatoya mountains, Nevada. . ;. I Muschelkalk. 

 Esmeralda county, Nevada j 



Ta3dorville, California Noric and Karnic. 



American canyon, California : 



Monotis bed. 



