Fia. 4.—Diagram section to illustrate the mode of formation of the contortions. S.W. 
N.E. 
Clement Reid—Glacial Deposits of Cromer. 
the Chalky Boulder-clay, 
but in lithological charac- 
ter much like the First 
Till, with which it has 
always been confounded. 
As we trace this bed 
north - westward it be- 
comes more chalky, in 
fact so much so that it 
is difficult to distinguish 
from the Chalky Boulder- 
clay, into which it prob- 
ably passes near Wells. 
The diagram (Fig. 4) 
will give an idea of the 
relations and mode of oc- 
currence of the different 
beds, but I am unable to 
offer any exact calcula- 
tions as to the extent of 
lateral movement. 
It is evident that the 
amount of vertical thick- 
ening of the beds gives 
the measure of their 
lateral compression and 
horizontal movement, so 
that a bed doubled in 
thickness is compressed 
into half its original ex- 
tent, and if one end is 
stationary the other will 
have moved a distance 
equal to half the total 
breadth. 
If we try to obtain some 
estimate of the probable 
extent of the lateral com- 
pression of the beds, we 
are at once met by the 
difficulty that the coast 
section runs nearly at 
right angles to the line of 
force,and we need sections 
along that line. However, 
by means of projecting 
points and of various 
stream channels we find 
that near Cromer the 
ih beds must have been 
H Middle Glacial. 
G Contorted Drift. 
F Sands. 
bare) 
2 
is] 
Ave — 2 B.a SF 
o 
and forming Chalky Boulder-clay TI. 
ulder-clay, and pushing forward a mass of the older beds, at the base of which a ground-moraine 
o 
E Till. 
a 
OV en 
ast, 
g at its base Chalky Bo 
D Pre-glacial Beds. 
-west flowing parallel with the co 
I’ is sometimes formed. 
B Ice from the north-east, formin 
C Chalk. 
A Ice from the north 
