360 Mr. Lyell on the Boulder Formation, 



event. Although there is an obvious connexion between the 

 amount of derangement of the newer strata and tlieir 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 Trimnlingham, we find the 

 cliffs near Overstrand, about a mile S.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. 



chalk. \ 



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 4-0°, 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 



