528 D. MILNE HOME ON HIGH-WATER MARKS ON THE 
parts of its course, no old terraces. Its banks are composed chiefly of high 
rocks. It is only when river banks are composed of detrital matter, that old 
flats or cliffs need be looked for. 
~ But in the upper parts of the Till, where it meanders through the 
extensive flat district called Millfield Plain, there are on the rising grounds 
surrounding the plain, lines of water action, which deserve attention. 
The annexed diagram (on Plate XXXVII., reduced from the Ordnance Sur- 
vey) shows, by the blue line, the course of the River Till from its junction with 
the Tweed, upwards to the south, and that of its two tributaries—the Glen and 
the Wooler Water—both of which come from the Cheviot hills situated to 
the S.W. 
The interrupted line surrounding Millfield Plain indicates a bank or slope 
of land up from the plain, which, along the North, West, and South, and part 
of the East margin of the plain, is very noticeable. 
The continuous black line more or less parallel with the interrupted shaded 
line, and almost everywhere outside of it, is the Ordnance Survey contour line 
of 200 feet above the sea. 
The interrupted line indicating the base of the sloping bank, has an 
average height of from 175 to 185 feet above the sea. From the base of 
this bank, flat ground extends everywhere towards the central parts of the 
plain. To the east of Kirknewton, this flat ground is occupied, near the 
base of the bank, by a number of large boulders, apparently of the same rock 
as the rocky hill to the south, and from which they may have fallen. 
It has been mentioned, that the sloping bank is least noticeable on the east 
side of the plain. No rivers flow into the plain from the eastward, or along the 
east side of the plain. Therefore no current existed along the east side of the 
plain, to form a cliff or bank. The general surface of the country on that side, 
owing to dip of the strata towards the east, slopes away from the plain; so that 
the rain which falls, flows eastward. The Cheviot hills bound the plain on the 
west, and from these hills several small rivers and streamlets flow down upon 
the plain on that side. 
But even on the east side there are occasional traces of a slope in the 
surface, down towards the plain, as at Doddington and Fenton. The slopes 
on that side, are at a very small angle. Therefore the old beach line on that 
side is at a greater distance from the 200 feet contour line, than on the sides 
of the plain where the banks are steeper. 
Millfield Plain is about 7 miles long, and at one place about 3 miles 
wide. 7 
The question may now be asked, What has formed this a water-line, which 
is more or less horizontal, round this extensive area ? 
It seems very unlikely to have been formed by a river or rivers; for the banks 

