360 ON GEOLOGICAi NOMENCLATUEE. 



Koninck divides it into an upper and a lower division. The Lower 

 Limestone Shales and Calciferous Sandstones, &c., of Ireland are 

 grouped under the name of "TJrsien" from the locality of Bear 

 Island, whence the fossil flora has been minutely described by 

 Prof. Heer. 



The classification of the Devonian agrees with that used in England. 

 "When we come to the Lower Palaeozoic, of course the classification 

 has to be taken entirely from England or K. America or Bohemia : 

 Prof. Kenevier has adopted mostly English names for the divisions 

 of the fourth column. 



"We have before alluded to the use of the word Silurian and 

 Siluriqae in different columns, the one made equivalent to our 

 Lower Palaeozoic, and the other about equal to the Lower Silurian 

 of English authors, being opposed to the " Murchisonien " which 

 stands for our Upper Silurian. If one part of the Silnrian system 

 is to be called jafter jMurchison, perhaps the other might have been 

 named after Sedgwick ; that would have been one way of avoiding 

 the double use of the same root. Ly ell's arrangement of the Lower 

 Palaeozoic wiU be preferred by Englishmen probably. The [table 

 is based on the latest researches of Dr. Hicks as far as the sub- 

 divisions of the Cambrian is concerned. 



"We can see that there must have been an immense amount of 

 work in drawing up this table of Sedimentary Rocks, from the 

 quantity and compactness of the information which it conveys. A 

 scheme too of this sort is very easy to refer to, — the eye catches the 

 object sought at once, and the parallelism of the groups is better 

 fixed in the memory after seeing them in tabular form than perhaps 

 in any other way, "We can therefore heartily recommend it to 

 English students, more especially as there is no table published in 

 England which includes nearly so many foreign groupings of beds. 



