NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 



307 



This bed is the Ross Lake shale, and the remains of ^"' ^""' 



the Albertella fauna occur abundantly in it in several 

 localities. The fauna includes (63J) : 

 Siliceous sponge spicules 

 Eocystitcs ? sp. 



Micro initra (Paterina) zvapta Walcott 

 OboJus parvus Walcott 

 Acrothele colleni Walcott 

 Wimanella simplex Walcott 

 Hyolithellus flagcllum (Matthew) 

 HyoUthes cecrops Walcott 

 Agraulos stator Walcott 

 Kochiella cf. americanus Walcott 

 Vanuxcmella nortia Walcott 

 Albertella bosworthi Walcott 

 Albertella helena Walcott 

 Balhyuriscus rossensis Walcott 

 On the slope of Mount Bosworth, the shale is a 

 little thicker and we collected 10 of the above species 

 in situ (63 m). 



From the boulders (35c) found below the outcrop 

 on the south slope of Mount Bosworth in earlier years, 

 there have been collected 13 of the above species and 

 an adtlitional one, Hyolithellus hectori Walcott. 



3. Massive-bedded, gray and mottled, rough-weathering 



arenaceous limestone jg^ g g 



4. Compact, dove-gray colored limestone in thin layers... 12 



5. Massive-bedded, dirty gray colored, rough-weathering, 



calcareous sandstone ' 2-=; 



6. Alternating layers of bluish-black and steel-gray, hard 



limestone .... 



52 



Total referred to Ptarmigan formation 664 



LOWER CAMBRIAN 

 Mount Whyte Formation 



1. Gray to grayish-black, thin-bedded oolitic limestone. ... 43 131 

 FaMWff.— Many small fragments of trilobites. 



2. Finely banded, gray sandstone, and hard arenaceous 



limestone 



3- Gray, finely oolitic limestone in thick beds that break 



down into thin, irregular layers ig 



Fauna.— At 15 feet (4.6 m.) from summit (63k) : 



Nisusia (Jamcsella) loivi Walcott 

 Pelagiella sp. undt. 

 Helcionella elongata (Walcott) 

 Scenella varians Walcott 

 HyoUthes billingsi Walcott 

 " Ptychoparia" cecrops Walcott. 

 9 



3-7 



83.8 



15.8 



202.3 



I -5 



5-5 



