Raymond: The Chazy Formation and its Fauna. 511 



Stylaro'a parva, Flectoccras Jaso/i, 



Rafinesquina incrassata, Pliomerops canadensis, 



Camarotoechia orientalis, llhcniis g/obosus, 



Camerella longirostris, Eoharpes anliquatus. 

 Camcrella varians. 



There is onl)' one species, CainarotcEcliia orienfa/is, which is com- 

 mon to the Mingan Island fauna and the fauna of the Chazy (Aylmer 

 formation) of the Ottawa valley. 



Sections and Faunal Lists in the Champlain Region. 



In order to determine the geographic and stratigraphic range of the 

 Chazy species, collections have been made at various points along 

 Lake Champlain, at Montreal, and at Ottawa and Aylmer. It was 

 also desired to study the associations of species as faunules, and to see 

 if these faunules were characteristic of any particular horizon, so that 

 they might be useful in stratigraphic work. As Valcour Island pre- 

 sented the most complete section of any locality near the type section 

 at Chazy, the Valcour Island section has been worked up with much 

 care and will serve as a basis for comparison. 



Section A, along tiie SoiitJi End of Valcour Island, with Faunal Lists. 



The section begins on the south end of the Island, just east of the 

 most southern fault marked on Brainerd and Seely's map, and runs 

 northeast along the shore to the southeast point of Valcour Island. 

 No attempt was made to collect from every layer, but the strata were 

 carefully measured and wherever fossils were numerous a full collection 

 was made, thus showing the fauna at thirty-nine stations in the 614 

 feet of layers actually exposed along the line of this section. 



A,. A dense, hard quartzite in thin layers with shaly partings. The 

 sandstone is full of fragments of Lingiila;. This may not be the actual 

 base of the formation, but comprises the lowest layers ex])Osed at low 

 water in the seasons the writer has spent at Valcour Island. Professor 

 Hudson informs me that he has been able to sample still lower layers 

 which seem to be similar. 3 feet = 3 feet. 



Lingula brainerdi c.^^ 



Aj. A foot of non-fossiliferous greenish shale. i foot = 4 feet. 



^5 The usual signs will be used to show the relative abundance of the species; a 

 = abundant, c = common, r = rare, R ^i very rare. 



