and Freshwater Deposits of Eastern Norfolk. 371 



Among the above, the Fusus striatus and Nucula Cobboldicc 

 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, Weybourne, 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 S 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 Weybourne, at the extreme end of the cliff, 

 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, Weyhourne ; height of section IQfeet. 



a b o sand and loam. 



a, c. flint gravel with crag shells. 



b. loose sand. 



THEORETICAL CONSIDERATIONS. 



Age of the deposits comiposing the mud cliffs. — It has been 

 shown in the above account of the cliff's 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 oi a few yards above that level. Its surface between 

 Cromer and Weybourne is covered with occasional patches of 



