HARMER : THE PLEISTOCENE DEPOSITS OF EAST ANGLIA. 319 
•deposits of the Cromer coast. His Survey Memoir.* and the 
detailed section of the coastf are so well known, however, that 
it is not necessary to allude to them here at any length. 
The divisions of the coast drifts which Mr. Reid adopts 
are well shown at the Hasboro' end of the Cliff section. To 
the north-west of Trimingham the succession cannot be so 
satisfactorily traced, owing to the disturbed condition of the 
beds. 
As we follow the Contorted Drift from Cromer towards the 
west it becomes more and more chalky, being over a large area 
in that region commonly burnt for lime in preference to the 
Chalk itself. To the east of Weybourne, near Cromer, and 
further towards the east, it contains enormous masses of Chalk 
and of chalky marl see PI. XLIII. From Cromer and Hasboro' 
southwards towards Norwich, and south-eastwards towards 
Yarmouth, the Contorted Drift assumes the character of a red 
sandy brickearth, occasionally containing minute pellets of chalk, 
but more frequently without them. Where the clay is of a 
sandy and comparatively permeable nature, the latter may have 
been removed by the infiltration of acidulated water. The 
Lower Glacial clays contain, though not abundantly, erratics 
■of igneous and of other rocks, of moderate size, occasionally 
attaining a length of three feet or more. They are seldom to be 
seen in situ, though they are frequently met with inland in 
North-east Norfolk, near farm buildings or by the roadside, 
possibly representing the accumulation of centuries, a few of 
them being of Scandinavian origin. J A great opportunity 
presents itself to any petrologist who would set himself seriously 
to investigate during a summer visit to the Norfolk coast this 
most important, and until lately, comparatively neglected 
subject. My friend, Mr. H. B. Muff, of H.M. Geological Survey, 
was kind enough some time since to examine microscopically 
a portion of one of the most characteristic erratics of the Lower 
Glacial brickearth of the Norwich district, and reported that 
* Mem. Geol. Survey, Cromer, 1882. 
t Horizontal Section, Sheet 127. 
X Almost all the large erratics of the coast-region are those of igneous 
rocks. 
