446 



MR. W. H. HTTDLESTON ON THE 



mass of brown laminated loams with blue centres. This constitutes 

 the main exposure, where sandy intercalations are less frequent. 

 The clay is greasy to the touch and behaves like putty when first 

 handled, yet when dried and pulverized it is found to consist very 

 largely of sand, chiefly quartzose, but with a fair proportion of 

 glauconitic granules. Although tenacious and impermeable to a 

 very high degree, it is doubtful whether these beds would constitute 

 a good brick-earth. On the other hand these loams are much sought 

 for by gardeners, as they are evidently possessed of valuable fertilizing 

 properties. The glauconitic granules are much smaller than those 

 of the Middle Bagshots of St. Anne's Hill, which I use as a standard 

 of comparison, and the periphery of the individual grains is less 

 smooth. On the other hand there are fewer fractured granules 

 than were noticed in the lower beds. Thus, whilst in a sample from 

 St. Anne's Hill the grains average ^ millimetre in longer diameter, 

 these grains are certainly less than one fifth. The bluer portions 

 of the beds contain numerous nodular aggregates of sandy pyrites, 

 from 20-50 millim. in length, usually in association with fragments 

 of lignite. 



4. BeMAINDER OF THE CUTTING. 



The portion above described was the last excavated, but the 

 widening of the line has been continued as far as Weybridge Station, 

 and the works are now completed between Walton and "Weybridge 

 Stations. As far as Haine's Bridge (mentioned in the previous 

 paper), the series ISTo. 5 maintains its character as fine buff sand 

 with clay laminations, and is not to be distinguished lithologically 

 from jSTo. 3 series. In fact these two series are certainly typical of 

 the Lower Bagshots of this district, and both of them must be of 

 considerable thickness. The base of the clay series ~No. 4 may be 

 about 40 ft. above the London-Clay surface, but this depends very 

 much upon the behaviour of No. 1, the very false-bedded series. 

 Above ISTo. 5 I have not succeeded in distinguishing any series at 

 present, because, west of Haine's Bridge, the exposures during the 

 widening were not of a clear nature, owing to the methods of working 

 adopted. Bright yellow fine-grained sands, similar to those so well 

 known between Weybridge Station and the river Wey, are seen for the 

 most part ; still it is certain that even in this portion of the cutting 

 there occurs a certain proportion of argillaceous beds. The precise 

 mode of development of these Lower-Bagshot clays could not be 

 ascertained, but I was led to suspect that they form small basins 

 of argillaceous matter in the midst of the sands. The exposures 

 between Haine's Bridge and Weybridge Station would lie in the 

 very heart of the Lower Bagshots, here estimated by Prestwich at 

 130 ft. in thickness. 



5. The Brick-earth of Hatch. 



Thus far we have felt our way carefully, and the sequence of 

 the Lower Bagshots in the railway-cutting may be regarded as 



