THE JURASSIC PERIOD. 



229 



characterised by special life-forms than has as yet been found 

 practicable in the case of any other rock-series. 



Generalised Section of the Jurassic Rocks 

 OF England. 



Fig. 159- 



o 



o 



8 < 



_i_^ s i ) t ,s / f i ( 



II II l{ II K 



M y_ 



II !l il 



11 M \\ _\\ II 1) IT 



II H t( 



II II II II IT 



I 11 ;i It 



— Purbeck Beds. 

 -Portland Beds. 



-Kimmeridge Clay. 

 -Coral-Rag. 



-Oxford Clay, 



-Cornbrash and Forest-marble. 

 -Great Oolite. 



-Fuller's Earth. 

 -Inferior Oolite. 



Upper Lias, 



Middle Lias (Marlstone 

 series). 



Lower Lias. 



.„ j Rhastic Marls (" White 

 Lias "). 



The plants of the Jurassic period consist principally of 

 Ferns, Cycads, and Conifers — agreeing in this respect, there- 



