Ch.XXII.] 
RECAPITULATION. 
321 
those rocks in particular, which are common to the Paris basin 
and Central France, being wanting, or extremely rare, in the 
English tertiary formations. 
3. The Eocene deposits of England are generally conform- 
able to the chalk, being horizontal where the beds of chalk are 
horizontal, and vertical where they are vertical ; so that both 
series of rocks appear to have participated in nearly the same 
movements. 
4. It is not possible to define the limits of the ancient bor- 
ders of the tertiary sea in the south-east of England, in the 
same manner as can be frequently done in those countries where 
the secondary rocks are unconformable to the tertiary. 
5. Although the tertiary deposits are chiefly confined to the 
tracts called the basins of London and Hampshire, insulated 
patches of them are, nevertheless, found on some of the highest 
summits of the chalk intervening between these basins. 
6. These outliers, however, do not necessarily prove that 
the great mass of tertiary strata was once continuous between 
the basins of London and Hampshire, and over other parts of 
I the south-east of England now occupied by secondary rocks. 
7. On the contrary, it is probable that these secondary dis- 
tricts were gradually elevated and denuded when the basins of 
London and Hampshire were still submarine, and while they 
were gradually becoming filled up with tertiary sand and clay. 
8. If, in illustration of this theory, we examine one of the 
districts thus supposed to have been denuded, we find in the 
Valley of the Weald decided proofs, that since the emergence 
of the secondary rocks, an immense mass of chalk and subjacent 
formations has been removed by the force of water. 
9. We infer from the existence of large valleys along the 
outcrop of the softer beds, and of parallel chains of hills where 
harder rocks come up to the surface, that water was the re- 
moving cause ; and from the shape of the escarpments pre- 
sented by the harder rocks, and the distribution of alluvium 
over different parts of the surface of the Weald district, we 
Vol. III. Y 
