508 BRAINARD AND SEELY — THE CALCIFEROUS FORMATION. 



Chazy I G). They were described in the Bulletin of the American Museum 

 of Natural History, Vol. I. No. 8, as Birdseye; and here we rested. 



We arc convinced now that these Fort Cassin rocks, with their numerous 

 fossil forms, belong to the upper part of division D of the Calciferous. We 

 base our opinion on the frequent identity >f genera and species, the close 

 lithological resemblance with the rocks known to be of horizon D, and the 

 entire absence of the Fort Cassin rocks along the lake where the Birdseye 

 ought to appear it' it exists in Vermont. 



The Canadian Exposures. 



Brief reference may he made to the Phillipsburgh series, which extends 

 four or five miles into Vermont. Lagan's division A, with its three sub- 

 divisions, 700 feet in thickness,* is lithologically identical with our divisions 

 A, 11, ami C respectively of the Calciferous. The remarkable fossil, Criip- 

 iozoon gteeli (n. sp.), we have observed in the reticulated limestones of ^4 2 

 at Phillipsburgh. Similarly, the first four members of Logan's division B 

 correspond to our division D, both in lithological character and in fossil >.'<" 

 The beds of Calciferous sandstone are as prominent ami peculiar at Phillips- 

 burgh as at Shoreham. The magnesian \mU of our division E are, however, 

 but poorly represented in the lower part of Logan's division B 5, but in a 

 similar way they thin out and disappear in the eastern part of Addison 

 county, Vermont. The higher beds of B 5 at Phillipsburgh, and the beds of 

 C 1 seem to be represented in western Vermont, but by the lower beds of 

 the Chazy. 



A Bimilar comparison might be made between the Calciferous of Lake 

 Champlain and the 1,830 feel of strata on the northwest coast of Newfound- 

 land (divisions 1) to L of the Geology of Canada). J 



Misapprehensions ( Iorrected. 



In connection with this discussion, various misapprehensions regarding 

 some of the rocks of Vermont should be mentioned and corrected. In the 

 Vermont Report, volume I. 1861, pp. 267-269, certain slates are described 

 as belonging to the < lalciferous group. < me exposure is cited in the exl reme 

 bhwesl corner of Shoreham, and another, farther Bouth, in Orwell, with 

 ledges running along the lake shore. The rocks in both of these Localities 

 have afforded fossils of the Qtica -late. So these slates of Vermont must 

 disappear from the ( lalciferous formation. 



ol of > u ■ II. 



• ■Ml., p| 



I oit., p. 860, el Mq. 



