CHAPTER XX. 



Eocene formations, continued Basin of the Cotentin, or Valognes Rennes 

 Basin of Belgium, or the Netherlands Aix in Provence Fossil insects 

 Tertiary strata of England Basins of London and Hampshire Different 

 groups Plastic clay and sand London clay Bagshot sand Fresh-water 

 strata of the Isle of Wight Palseotherium and other fossil mammalia of Bin- 

 stead English Eocene strata conformable to chalk Outliers on the elevated 

 parts of the chalk Inferences drawn from their occurrence Sketch of a 

 theory of the origin of the English tertiary strata. 



HAVING in the last three chapters treated of the Eocene 

 formations of different parts of France, we now propose to 

 examine those which are found in the south-eastern division of 

 England; but before we pass from the continent to our own 

 island, we may briefly advert to several other spots where 

 Eocene deposits have been observed. Their geographical posi- 

 tion will be found delineated on the annexed map *. 



MAP OF THE PRINCIPAL TERTIARY BASINS OF THE EOCENE 



PERIOD. 



No. 62. 



TEocene formations. 



li&'-xl Primary rocks and HI 



strata older than the carboniferous series. 



N.B. The space left blank is occupied by secondary formations, from the old red 

 sandstone to the chalk inclusive. 



* This map is copied from one given by M. Desnoyers, Mem. de la Soc.d'Hist, 

 Nat. de Paris, 1825, pi. 9 j compiled partly from that author's observations, and 

 partly from Mr, Webster's map, Geol, Trans., 1st series, vol. ii. plate 10. 



T 2 



