88 
FUSULINA LIMESTONE OF THE LOWER VOLGA. 
flanks of the Ural and in the northern part of the great carboniferous district of 
the south or Russia. At both the last-mentioned localities they unquestionably 
occur in the highest members of the carboniferous limestone. 
We shall now direct attention to the great carboniferous tracts of Southern and 
New Russia, between the Dnieper and the Don, where the strata are highly in- 
clined, and in a very different lithological condition from the rocks described in 
this chapter. 
