46** PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



south, to enable us to define the form of that internal depressed area 

 over which the low-level coal-growths of France, Belgium, and 

 Britain were accumulated. 



The second special object of the memoir was to show that the area 

 thus defined was subsequently disturbed, whereby lines of elevated 

 strata were produced, one of which, having a general direction from 

 east to west, has had the effect of placing the Coal-measures near the 

 present surface along a great portion of its course. This line, as well 

 as those which indicate the influence it has exercised with reference 

 to the distribution and limitation of the secondary groups, are ren- 

 dered sufficiently distinct, allowance being made for the scale of the 

 map. 



Such being the nature of the map, the names of places have been 

 omitted ; their positions, however, in many instances are indicated ; 

 and as the map has been carefully drawn, the reader will have no 

 difficulty in following the exact course of every line indicated on it, 

 by reference to any ordinary geographical map. 



