360 
Mr. Lyell on the Boulder Formation^ 
event. Although there is an obvious connexion between the 
amount of derangement of the newer strata and their proximity 
to the outliers of chalk, I saw nevertheless no signs of the 
masses of solid chalk having pierced the newer beds, as if 
forced through them ; on the contrary, it appeared to me in 
every case, that the lowest bed of the drift, whether inclined at 
a high angle or vertical, conformed everywhere to the surface 
of the chalk, as if the same bed might have been originally 
in contact with it when horizontal. The chalk itself appears to 
have been in a flexible state, and therefore its beds of flint are 
variously bent. 
Proceeding northwards from Trimmingham, we find the 
cliffs near Overstrand, about a mile 8.E. of Cromer, entirely 
composed of clay and sand ; but this drift does not continue 
far inland, and if the sea should advance for a few hundred 
yards, we might expect to see the whole cliff composed of 
chalk ; for at the surface at Overstrand, a chalk pit is worked 
in which the very disturbed and shattered state of the chalk 
deserves notice. 
Fig. 9. 
stratified 
rubble. A 
gravel. 
chalk. 
stratified 
rubble. 
chalk. 
Disturbed chalk in a pit at Overstrand, near Cromer, 
In one part of the quarry we find what appears to be a 
fault, the line A B (fig. 9.) representing 18 feet in vertical 
height, where the solid chalk with flints, inclined at about an 
angle of 40°, comes abruptly in contact with alternating beds 
of white chalk rubble and gravel having an opposite dip, also 
at an angle of about 40°. After removing part of the chalk 
rubble I ascertained that the plane of the fault was continuous 
inwards at right angles to the line of section represented in 
the annexed diagram. The inclined chalk is covered by beds 
of stratified rubble resembling those before mentioned. 
I stated that there were no signs of the submerged forest 
or freshwater deposit at the junction of the drift and chalk at 
Trimmingham, but this forest has been seen by Mr. Simons, 
about a mile and a half north-west of Trimmingham, at a 
