and Freshwater Deposits of Eastern Norfolk. 37 1 
Amonof the above, the Fusus striatus and Nucula Cohholdice 
were very rare. 
I have remarked, that westward of Sherringham, where the 
fundamental chalk rises a few feet above high-water mark, its 
surface, whether covered by the ferruginous breccia or not, is 
for the most part very level, a singular fact when the contor- 
tions of the overlying strata are considered. A slight excep- 
tion occurs at one place near Cliffend, Wey bourne, where the 
surface of the chalk undulates ; so that in the distance of a 
few paces the chalk sometimes rises 12 feet above the level 
of the sea, then sinks to 1 foot, and then rises again to 8 feet 
above that level, being covered everywhere with a similarly 
undulating breccia made up of slightly rolled chalk flints and 
crag shells more or less broken. 
Finally, near Wey bourne, at the extreme end of the clilF, 
where it is 10 feet in height, the section given in the annexed 
diagram (fig. 18.) is seen. We here see the shelly crag sub- 
jected to the same violent movement so common elsewhere 
in the drift. The vertical gravel beds a c are separated by 
loose sand. Other loose sand occurs in the arch at c c. The 
crag shells in the gravel, consisting chiefly of Cardium and 
Cyprina^ are in fragments, and the denudation of such beds 
may well have supplied those smaller and worn pieces of 
these shells which are so widely dispersed through the mud 
cliffs of Eastern Norfolk. 
Fig. 18. 
Arched beds of shelly crag at Cliffend, Weybourne ; height of section feet. 
a, c. flint' gravel with crag shells. 
h. loose sand. 
THEORETICAL CONSIDERATIONS. 
Age of the deposits composing the mud cliffs . — It has been 
shown in the above account of the cliffs between Hasborough 
and Weybourne, that the chalk is everywhere the funda- 
mental rock, lying southward of Cromer at about the level 
of low water, and rising on the north of that town to the 
height of a few yards above that level. Its surface between 
Cromer and Weybourne is covered with occasional patches of 
