138 
and the section, which is 200 feet in depth, is very clearly 
laid open throughout a horizontal distance of several hun- 
dred yards. It is represented in cross section in the figure 
below. 
Section of Drift Deposits in the Banks of the Ribble 
at Balderston. 
c Upper Till. .Reddish Till, from 70 to 80 feet in thickness. 
B Middle Sand. Yellow and white soft sand, with beds of gravel, 
from 85 to 90 feet. 
C Lower Till. Dark blue stiff clay, forming the bottom of the 
bank, about 25 to 30 feet in thickness. 
The line of demarcation between the several members of 
’ the drift in this section is remarkably clear, and shows the 
great importance of the Upper Till, which forms the top of 
the bank for a depth of about 85 or 90 feet, and spreads over 
the country for miles. If there were no other section than 
this it would be sufficient to establish its place in the series 
of Drift Deposits. 
In this section, and in some others I have noticed, there 
appears to be a difference between the Upper and Lower 
beds of Till. The Upper seemed to partake of a laminated 
or bedded structure, while the lower (as far as it was possi- 
ble to judge at some distance, as it was inaccessible) seemed 
to want any appearance of stratification, and to correspond 
rather to the description which Mr. Geikie gives of the 
Lower Till of Scotland. This he considers to have been 
