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 
—— 
= aaa 
= === = 
TT ee * $$ 
Sew ee Tes 
per eee a =| --- Ba peck Beds, 
nacre ara (Panay Rees Portland Beds. 
Kimmeridge Clay. 
SSL 
UPPER OOLITES. 
MIDDLE OOLITES. 
et fe a te a de ee Cornbrash and Forest-marble. 
is Wee ~ ~ mal dah Bs oe Great Oolite. 
Sr SS eS aS ---------- Fuller’s Earth 
if i aaa yi ‘ ‘ 
— : a ea Wey eee eee Inferior Oolite. 
LOWER OOLITES. 
SSS SSS] -------- Upper Lias. 
TETAS. 
JH Middle Lias (Marlstone 
series). 
ie ee ig coat ae. 
crs Re Se ea 
_—— SS 
SSS Oxford Clay. 
=== SSS 
— 
SSBB Lower Lias. 
Saas sais hep ee Rheetic Marls (** White 
ms s P| AK Oh Se we Lias “3 
The flants of the Jurassic period consist principally of 
Ferns, Cycads, and Conifers—agreeing in this respect, there- 
