XV. 



II AN OUTLINE OF THE GEOLOGY OF SUFFOLK. 



fN the brief outline of the Geology of the County which follows.I have 

 not attempted to discuss the different theories which have been 

 brought forward to account for the various changes which produced the 

 different beds ; neither have I entered at length in.o the lists of fossils 

 found in them, but have sought within the narrowest limits to give as 

 many details as would be necessary, in a work devoted to another sub- 

 ject, to give the reader a general idea of the stratification of the beds 

 which compose the surface of the County. 



The Geological strata met with in the County of Suffolk belong to 

 the Secondary and Tertiary groups ; the former being represented by 

 its upper member the chalk ; and the latter by many of its consti- 

 tuent members, some of which are almost peculiar to this County 

 I aUude to the crag deposits, which are so strongly developed in it, and 

 indeed only continue for a short distance into the neighbouring counties 

 of Norfolk and Essex. In a tabular form the strata of Suffolk are in 

 Geological succession : 



SECONDARY- 



LOWER CHALK. 

 UPPER CHALK. 



I _ 



<r 



UJ 



EOCENE 



MIOCENE 



PLIOCENE 



PLEISTOCENE : 



Thanet Sands. 

 Reading Beds. 

 Oldhaven Beds. 

 ^ London Clay. 



Remains of Boxstone Deposit 

 at the base of the Crags. 



: Coralline Crag. 

 Upper Crag. 



Norfolk Forest Beds. 



{Lower Boulder Clay. 

 Middle Drift Sands. 

 Upper Boulder Clay. 



C Valley & Plateau Gravels 

 Post Glacial 1 Alluvium 

 (.Peat 



