On a New Geological Fonnation in Canada. 305 



XOTE. 



This section is only approximate. It represents only 

 a small portion of measures apparently as thick as at 

 Union, seen also in Knoydart Brook and other streams of 

 the vicinity. It is not supposed that either the base or 

 the summit of the series is here given." 



The above series of strata (exclusive of the "' trap ") 

 constitute part of the succession to which the term 

 Xnoyckirt formation is applied, in order to separate it from 

 the "^'arious members of the Silurian system to the east of 

 and in close relation to the Devonian series. The local 

 divisions of the Silurian fall naturally (and provisionally) 

 into four formations, in descending order as follows : — 



The SxoNEHorsE formation. 



The Moydaet foemation. 



The McAdam formation. 



The Arisaig formation (limited). 



For a definition of these formations by the writer, see 

 the January number of the Supplement (Xo. 1307) to TJie 

 Scientific American, Xew York City, p. 20949, in Dr. E. 0. 

 Honey's article on the Albany Meeting of the Geological 

 Society of America and the discussion of the papers read. 



