3B RELATION OF UNSTRATIFIED 
a total amount of more than five miles ; but as 
the transition and primary strata very much 
exceed this average, the aggregate of all the 
European stratified series may be considered to 
be at least ten miles. 
Chapter IV. 
Relation of Unstratified to Stratified Rocks. 
I SHALL enter into no further details respecting 
the component members of each group of strati- 
fied rocks, than are represented by the lines of 
division and colours upon the section.* They 
are arranged under the old divisions of primary, 
transition, secondary, and tertiary series, more 
* For particular information respecting the mineral character 
and organic remains of the strata composing each series, I must 
refer to the numerous publications that have been devoted to 
these subjects. A most convenient summary of the contents of 
these publications will be found in De La Beche s Manual of 
Geology, and in Von Meyer’s Palseologia, (Frankfurt, 1832); 
ample details respecting the English strata are given in Cony- 
beare and Phillips’s Geology of England and Wales. See also 
Bakewell’s Introduction to Geology, 1833 ; and Professor Phil- 
lips’s article Geology, in the Encyclopcedia Metropolitana ; also 
Professor Phillips’s Guide to Geology, 8vo. 1834; and De La 
Beche’s Researches in Theoretical Geology, 8vo. 1834. The 
history of the organic remains of the tertiary period has been 
most ably elucidated in Lyell s Principles of Geology. 
