GRAPT01.J IKS OF NEW YORK, PART 2 29 



younger than the Nofmanskill shale [see postea\. It can therefore be said 

 that the Trenton limestone has thus far not furnished any evidence what- 

 ever of the presence of the Normanskill graptolite fauna in the limestone- 

 depositing' areas of the epicontinental sea. 



2 Magog shale (zone of Diplograptus amplexicaulis) 



Upper Dicellograptus subzone Gurley 



Lapworth [1887, p. 173] distinguished two subfaunas of the " Marsouin 

 River or Normanskill fauna" of Canada, viz : 



Subfauna A The Coenograptus zone of Griffin Cove and the Marsouin 

 river answering 1 to the Middle Llandeilo beds of Great Britain, to the Glen- 

 kiln beds of Scotland, etc. 



Subfauna B The Cove Fields and Orleans subfauna ; apparently des- 

 titute of Coenograptus gracilis, and answering to the highest 

 Llandeilo or lowest Caradoc beds of England. 



Of the Cove Fields and Orleans subfauna, it is stated that it "shows 

 evidence of a transition into the Utica-Lorraine Graptolitic fauna of the 

 Mohawk valley, New York, and of Lake St John, Canada. The following 

 species are cited from the two mentioned localities. 



1 Cove Fields, near Quebec city : 

 Diplograptus foliaceus Murchison var. Dicellograptus sp. 



D. amplexicaulis ? Hall Climacograptus two sp. 



D. truncatus (?) Lapworth C. bicornis Hall 



D. euglyphus Lapworth (?) Cryptograptus tricornis Carruthers 



Corynoides calycularis Nicholson Dicranograptus tardiusculus (?) Lapworth 



2 Island of Orleans, near Quebec city : 

 Dicranograptus ramosus (Hall) var. spino- C. bicornis Hall 



sus Lapworth Diplograptus foliaceus Murchison 



Climacograptus scharenbergi Lapworth 



Gurley secured a large collection near Magog 1 at the north end of 

 Lake Memphremagog, at the boundary of Quebec and New Hampshire, 



■A smaller list of the Magog fauna has also been given by G. M. Dawson [Geol. Sur. 

 Can. Rep't, v. 7, 1894, Ap. 1 3 3 J L This is copied by Richardson f^ 02 * P-^?] w ' :o figures 

 a characteristic slab of this graptolite shale. 



