liB ON THE GRAVELS NEAR HARKING SIDE, 



A very good section in a Gravel Pit at the Parish Sewage Farm 

 south of Wanstead Park was shown to me l)y Mr. Crouch. It is 

 composed of somewhat coarse material (flints, quartzites, Lower 

 Greensand chert, sarsen, sandstone, quartz, etc.), and is roughly, but 

 evenly, stratitied. Its level is about 25 feet O.D.* 



In a neighbouring mass of this low level gravel, which borders 

 the marshes of the Lea from Leyton up to the reservoirs of the East 

 London Waterworks near Walthamstow, a series of excellent sections 

 have been opened up during the construction of the Tottenham and 

 Forest Gate Railway. I have had the advantage of visiting these 

 sections in company with Mr. Whitaker and Mr. T. V. Holmes, an<i 

 also with the Geologists' Association, under the directorship of Mr. 

 J. W. Gregory. "^ 



The gravel is very like that at Wanstead Park, roughly stratified 

 and coarse. Subangular flints and flint pebbles form the bulk of the 

 gravel, but there is a great quantity of other material. I noted some 

 pebbles which are probably sarsen stone, or sandstone from the 

 Eocene beds, some fragments of Lower Greensand chert, a piece of 

 iron grit probably from an older gravel, and much small quartz, and 

 the following pebbles, which are probably erratics from the Glacial 

 Drift :— 



Large quartz pebbles. 



Very hard, brown, close-grained sandstone. 



Hard, light brown sandstone, with veins of quartz. 



Dark red coarse-grained sandstone. 



Brown and white soft sandstones, speckled with fragments 



which are probably mica. 

 White vitreous quartzite. 

 Two pebbles of igneous rock. 



Besides these stones 1 have some specimens from Walthamstow 

 which deserve special notice. The first are small quartzite pebbles 

 of a purple-pink or mauve colour, sometimes not unlike that of the 

 penny postage stamp now in use, and they are of interest because 

 they can be matched by pebbles which I have collected from the 

 Bunter Pebble Beds of Nottinghamshire, and I have no doubt they 

 come from that formation. I have found similar pebbles in the 

 Glacial Gravel of St. Alban's, Radlett, and Rainsford End near 

 Chelmsford, in the Thames Gravels at Dawley near West Drayton, 



4 See Whitaker, of>. cit., p. 409. 



5 Proc. Geol. Assoc. 1892, vol. xii , p. 338 ; Essex Nat. 1892, vol. vi., p. 97. 



