212 SMITHSONIAN MISCEi.i.aNEOUS COLLECTIONS VOL. 53 



STEPHEN FORMATION (continued): 



2d (continued) : Feet 



On Mount Stephen, at a horizon 150 feet from the base of 

 this limestone, the fauna includes : 

 Micromitra (Iphidella) pannula (White) [1874, p. 6]. 

 BillingscUa morion Walcott [igc&d, p. 102]. 

 Hyolithes. 

 Microdiscus. 

 Ptychoparia. 



CATHEDRAL FORMATION [Walcott, 1908a, p. 4] : 



la. Thin-bedded gray to lead-gray, arenaceous limestones, weather- 

 ing buff gray to dull light gray 404 



16. Massive bedded, steel-gray weathering, light gray, arenaceous 

 limestone. In some localities thinner layers appear at 

 various horizons and large lentiles of dark lead-gray-colored 

 beds occur very irregularly 682 



ic. Similar to la. Annelid borings and trails occur in and on 



some of the layers 126 



id. Similar to ib 83 



le. Thin-bedded, lead-gray to blue-gray, thin-bedded (layers i 



inch to 4 inches thick) arenaceous limestone 25 



if. Alternating thin and massive bedded, arenaceous, steel-gray 



limestone weathering light gray 275 



Total of 1 1,595 



LOWER CAMBRIAN 



MOUNT WHYTE FORMATION [Walcott, :908a, p. 4] : 



The line between the Middle and Lower Cambrian is placed at 

 this horizon on account of the presence in the Mount Stephen 

 section of Olenellus in the limestone 116 feet below the mas- 

 sive arenaceous limestone belt represented by if in the 

 Cathedral formation of the Mount Bosworth section. 



10. Thin-bedded, bluish gray, slightly arenaceous limestone 120 



Fauna : 



Numerous annelid trails and borings. 



ih. Gray oolitic limestone in layers 3 to 6 inches thick 44 



Fauna (4 feet from base) : 



Nisusia (Jamesella) loici Walcott [igoSd, p. 98]. 

 Microdiscus, sp. undt. 

 Agraulos sp. 

 Ptychoparia sp. 



At Castle Mountain fragments of a species of Bornciiuinnia 

 (new genus allied to Zacantlwidcs) occur at about this 

 horizon. 



