NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 3I3 



Feet Meters 



lb. Massive-bedded, steel-gray-weathering, light gray arena- 

 ceous limestone. In some localities, thinner layers ap- 

 pear at various horizons, and large lentils of dark 



lead-gray colored beds occur very irregularly 682 207.9 



ic. Similar to la 126 38.4 



Fauna. — Annelid borings and trails occur in some of the 

 layers of ir. 



Total Cathedral and Ptarmigan formations 1,212 ,369.4 



LOWER CAMBRIAN 



Mount Whyte Formation 



la. Thin-bedded, bluish-gray, slightly arenaceous limestone. 120 36.6 



Fauna. — Numerous annelid trails and borings. 



lb. Gray oolitic limestone in layers 3 to 6 inches (7.6 to 



15.3 cm.) thick 44 13.4 



Fauna. — (57s) : 4 feet, 1.2 m., from base. 



Nisusia (Jaiiicsclla) lozui Walcott 



Eodiscus sp. 



Acrotreta sagitallis taconica ? 



(Walcott) 

 Agraulos sp. 



" Ptychoparia " cleodas Walcott 

 Olcnopsis agresensis Walcott 

 Olenopsis cleora Walcott 

 IC. Massive-layers made up of banded bluish-gray limestone 

 and sandstone in layers 5 inch to 2 inches (1.3 to 



5 cm.) thick 60 18.3 



Fauna. — (57q) : 



" Ptychoparia " ad'ma Walcott 

 Crepiceplialus ? celer Walcott 



Total of 1 224 68.3 



2. Gray and brownish-gray sandstone in thin and massive 



layers 31 9.4 



Fauna. — (sSu) : 



Hyolithes sp. 



" Ptychoparia " cleodas Walcott 



3. Siliceous shale, with a few interbedded thin layers of 



compact, hard, gray sandstone 115 35.1 



in well developed form, even though it is not definitely shown in the sections 

 above, on which the field-work had been done prior to the establishment of this 

 formation with its peculiar fauna. I am sorry not to be able to completely 

 clarify the confusion Dr. Walcott left at this point where the manuscript had 

 not yet been brought altogether up to date. — C. E. R. 



