1 64 



HISTORICAL PALEONTOLOGY. 



wise altered vegetable matter, and that it is of the highest 

 economic value to man, the Coal-measures have been more 

 thoroughly explored than any other group of strata of equiva- 



GENERALIZED SECTION OF THE CARBONIFEROUS STRATA 

 OF THE NORTH OF ENGLAND. 



Fig. 107. 



Permian (New Red 

 Sandstone). 



> Coal-measures. 



Millstone Grit. 



Yoredale Series. 



Scar-Limestone Series 



Basement Beds (Con 

 glomerates and 

 Sandstones). 



lent thickness in the entire geological series. Hence we have 

 already a very extensive acquaintance with the plants of the 



