18 Geology. 



has paid much attention to this deposit. Numerous eoliths have 

 been obtained by him from the immediate neighbourhood of the 

 gravel. At Cockerhurst Farm, 470 feet above O.D., he also was 

 successful in finding implements of a primitive type, some of which 

 were striated. 



The gravel and sand deposit on the summit of Shooter's Hill 

 has been studied by Trimmer, Goodchild, Whitaker, Spurrell, 

 Prestwich, and others (12). 



Recently it has been visited by the Geologists' Association 

 (Proc. Geol. Assoc., vol. XIX., p. 103), and the various cuttings 

 made for electric light cables have been carefully studied by Mr. 

 A. L. Leach, from whose notes I obtain the following information : 



The trenches opened for electric light cables to Eltham showed 

 sections of the gravel-cap from the northern slope of the hill, along 

 Shrewsbury Lane to the Bull, and thence down the Shooter's Hill 

 Road to the corner of Well Hall Road. 



N. SLOPE. Gravel-cap begins just above the 400-feet contour on 

 the Ordnance Map, but there is a distinct trail of pebbles for a long 

 way down the slope. 



SUMMIT. The Trenches from about 400 feet above O.D. showed the 

 base of the gravel-cap for about 400 yards along Shrewsbury Lane ; 

 onward to the Bull the trenches were entirely in the cap, and the 

 London Clay was not again touched until about 100 yards above 

 'Christ Church. 



N.W. SLOPE. Thence to the foot of the hill the cutting was in 

 London Clay, but a distinct run of pebbles lay over the Clay down 

 to the Fire Station. 



JUNCTION WITH LONDON CLAY. In Shrewsbury Lane the cap 

 rests on a slightly irregular surface of London Clay, which, in its 

 upper layers, becomes lighter in colour and more sandy in feature ; 

 in some places the sandy London Clay passes imperceptibly into 

 the sandy gravel-cap ; in other places the clayey gravel cuts dis- 

 tinctly into the London Clay. No bedding was seen anywhere : 

 the sand and gravel are never stratified clearly like the Crayford and 

 Dartford deposits. 



SAND. Generally coarse, yellow to red and very dark red, 

 red, and usually clayey. Opposite the Bull a bed of fine clean 

 yellow sand, not of great extent. 



PEBBLES. Rarely 6 inches long, mostly not exceeding 2 or 3 ; 

 well rounded : forming irregular pockets in the sand, never an even 

 continuous bed. 



(12) Quart. Journ. Geol. Soc., 1853, Vol. IX. Proc. Geol. Assoc., 1885, 

 Vol. IX. Geology of London, 1889. Rept. W. Kent. Nat. Hist Soc., 1886. 

 Quart. Journ. Geol. Soc., Vol. XLVL, pp. 162-6. Proc. Geol. Assoc., 

 Vol. XIX., p. 8. 



