SEQUEL TO SYSTEMATIC GEOLOGY. 587 



Africa, and America. For instance, when the car- 

 boniferous group and the new red sandstone afe 

 stated to be found in India, we require to be assured 

 that these formations are, in some way, the equiva- 

 lents of their synonyms in countries better explored. 

 Till this is done, the results of observation in such 

 places would be better conveyed by a nomenclature 

 implying only those facts of resemblance, difference, 

 and order, which have been ascertained in the 

 country so described. We know that serious errours 

 were incurred by the attempts made to identify the 

 tertiary strata of other countries with those first 

 studied in the Paris basin. Fancied points of re- 

 semblance, Mr. Lyell observes, were magnified into 

 undue importance, and essential differences in mi- 

 neral character and organic contents were slurred 

 over (BA). 



