212 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Mr. Walker's measured section* near the head of Windermere 

 Creek is as follows : 



Beaverfoot-Brisco Formations ^ , 



Feet 

 Several hundred feet of light grey limestone disturbed and 

 poorly exposed. 



1. Light grey limestone weathering light grey. A 4-foot bed weathering 



dark grey at 16 feet from top. Fauna from top beds. J'irginia sp. 

 (Silurian) 64 



2. Grey limestone weathering a dark slate grey 10 



3. Light grey limestone weathering light grey. Stringers and nodules of 



black chert at 97 feet from top 127 



4. Grey limestone weathering a dark slate grey 55 



5. Chiefly grey limestone weathering a dark slate grey with light weath- 



ering bands in upper part. White chert nodules in a dark grey 

 horizon 50 feet from top. Crinoid stems observed beneath chert 

 horizon 65 



6. Light grey limestone weathering light grey. Crinoid stems observed 



25 feet from top 70 



7. Limestone weathering light and dark grey. Crinoid stems, corals, and 



brachiopod fragments observed at top. 



A collection from an horizon 100 feet from top contains : 



Halysites n. sp. (a) 



DiphyphyUuni n. sp. 



Favositcs sp. 



Sfrcptclasfiw sp. 



Rhynchotrcma n. sp. nr. R. capax 



Rhynchotrema sp. 



Brachiopod undt. 



Actinoceras sp. 



" This fauna shows the beginning of those forms which give a 

 Silurian aspect to beds which still retain an undoubted Richmond 

 fauna." 130 



8. Dark grey limestone weathering dark slate grey with a few light 



weathering beds. 



Fauna: from the top 



Rhynchotrcma incrcbcsccns n'. var. 

 75 feet from top 

 Streptclasiiia n. sp. 

 Halysites n. sp. 

 Coral undt. 

 Crinoid stems 



Rhynchotrcma incrcbcsccns n. var. 

 143 feet from top. lots A (upper) and B (lower) separated by 

 about 2 feet 



Lot A. Diiwrthis sp. 



Rhynchotrcma sp. (a) nr. R. capax 

 Byssonychia radiata var. 



*Loc. cit., p. 32-33. 



