154 



ME. W. H. HTJDLESTON ON A SECTION THROUGH 



B. Contains pebbles. One of iron-sandstone between 50 and 60 

 millimetres in longer diameter, also a bleached angular flint of 

 about the same size. The quartz grains are more rounded, duller, 

 and more unequal than in A. 



Fig. 4. — Singular Appeaimnce in the false-bedded Sands at the 

 " Corner/^ 



B represents a mass of sand irregular in shape and devoid of bedding, enclosed 

 in the false-bedded series (A). Its outline is ill-defined, much more so 

 than in the figure, and but for the complete absence of bedding one would 

 hardly notice it. The current-bedding of A, which inclines to the east- 

 ward, appears to suffer no interruption. 



Block B. (Fig. 1 and part of fig. 3.) 



Commencing with the sudden appearance of the London Clay in 

 situ, the second block comprises that portion of the cutting where 

 the London Clay forms the sides, and is directly overlain by the 

 Plateau-gravel. This is the longest block of the four, and perhaps, 

 on the whole, the most monotonous. Within this space the portion 

 of the London Clay exposed above the permanent way, after rising 

 pretty sharply at the " corner," constitutes a sort of plateau of 

 denudation, ranging from 10 to 15 feet above the line. The surface 

 is undulating within these limits, more especially towards the 

 western extremity of the block, where a shallow valley may be 

 noted. Beyond this the curve of the London-Clay surface rises to 

 13 feet, just before commencing that well-developed drop which 

 brings in the bottom beds of the Lower Bagshots on the west. No 

 fossils or Septaria were observed by me. The clay, when wet, is 

 bluish and tenacious ; when dried it is seen to be moderately sandy, 

 and of a darkish grey. The discoloured layer at the top is mostly 

 of a dull red, but varies to brown and yellow. It is usually less 

 than a foot thick beneath the gravel, except where there has been 

 a slight rupture of the surface, in which case the zone of discolora- 

 tion is wider. These phenomena are very similar to what was 

 observed in the " red loam " or " wet clay " of the New-Law-Courts 

 site *. 



* See paper by Hudleston and Price, Proc. Geol. Assoc, vol. iii. p. 44 (1872). 



