SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 53: 



The following table gives a summary of the new formations de- 

 fined, together with their thicknesses in each of the sections : 



St. Charles Formation 



Type Locality. — Bear River Range, west of the town of St. 

 Charles, in the Bear Lake Valley, Bear Lake County, Idaho. The 

 most accessible locality is in Blacksmith Fork Canyon, east of 

 Hyrum, Cache County, Utah. 



Derivation. — From the town of St. Charles, near the typical 

 locality. The stream flowing through St. Charles passes over the 

 formation. 



Character. — Bluish gray to gray, arenaceous limestones, with 

 some cherty and concretionary layers, passing at the base into thin- 

 bedded gray to brown sandstones. 



Thickness. — In Blacksmith Fork Canyon, 1,225 feet; in the sec- 

 tion west of Liberty, 1,197 f^^t. 



Organic Remains. — Upper Cambrian, passing at the summit 

 into Ordovician. 



Nounan Formation 



Type Locality. — Bear River Range, east slope of Soda Peak, 

 west of the town of Nounan, in the Bear Lake Valley, Bear Lake 

 County, Idaho. The most accessible locality is in Blacksmith Fork 

 Canyon, east of Hyrum, Cache County, Utah. 



Derivation. — From the town of Nounan, near the typical locality, 

 Nounan Creek Canyon cuts through the formation. 



Character. — Limestones. Light gray to dark lead-colored, 

 arenaceous limestones. 



