FAUNAL SUCCESSION OF THE UPPER BERNICIAN 



6t. 



Stratigraph ical Cha racter. 



The Five Yards Limestone, altliough displaying numerous 

 shaly partings, is free from thiclc argillaceous horizons. 

 Thickness about 15 feet. 



The Six Yards Limestone consists of some 18 or 20 feet of 

 calcareous strata in thick "posts" separated by thin beds of 

 shale. Beneath the limestone is a black shale, which at Little 

 Mill measures some 18 inches in thickness, and contains 

 lenticular masses of limestone and at the base a seam of coal. 



The Acre Limestone is a massive limestone about 17 feet 

 thick. Above the main bed is a thin band of calcareous rock 

 intercalated in the overlying shale. 



Favnal Diagnosis. 



Corals : -Characteristic forms : Zaphrentis civisti-icta, very 

 plenti'ul ; Zaphrentis near oystermouthensis ; Cyathaxonia 

 cornu ; Caniiiia nov. sp. All occurring in the Acre Lime- 

 stone, Ancroft. 



Brachiopods :— .S/^/r//"^/' plaiiicosta and Spirifer luickensis, 

 common at Little Mill (Six Yards Limestone). Prodiicliis (3 

 and variants abundant, especially in the Six Yards. 





h4 



h4 



,-J 



Fannal List. 



'Si 



> P. 



t5 



< 



Clisioph)'llum near subirabricatum, M'Coy 









Dibunoph)llum sp. 



- 



- 





Koninckophyllum magnihcum, Thom. & Nich. 





- 





Cyclopliylluni aff. pachyendothecum, Thom. 





- 



- 



Lithostrotion junceum (Flem.) ... 



- 



- 





Caninoid Campophyllum 



- 







Caninia sp. nov. 







- 



Cyathaxonia cornu, Nich. 







- 



Zaphrentis near oystermouthensis, Yaughan 





- 



- 



Zaplirentis delanouei, Ed. & H. 







_ 



Zaphrentis constricta, Carruthers 





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- 



