234 
Xotes on the London Clay and Bayshot Beds 
waterwom—the re-sorted pebble-beds and glacial gravels 
contain the Bagshot pebbles, with an admixture of angular 
flints, quartzites, and other travelled stones. These remarks 
will give a general idea of the relative position of the London 
Clay and Bagshot Beds; and premising that there is no very 
definite division between them, but that the clays gradually 
become more and more sandy until they reach the lower 
Bagshot Sand, which is described by Prestwich as consisting 
of hght yellow, fine siliceous sand, and which is now usually 
recognised as the basement-bed of the Bagshots, and also 
mentioning that these beds invariably lie conformably upon 
the London Clay, I will describe the section at Oakhill 
Quarry. 
Section at Oakhill Quarry, Epping Forest. 
The face of the quarry lies almost due east and west, 
and I have noted some six or seven distinct beds, but 
owing to the slips from the top and wash down the face, 
it is exceedingly difficult to see all the beds clearly at one 
time, although in dry weather most of them can be made out 
pretty easily. When I measured it last Easter the total 
depth of beds exposed was about 32 feet. The lowest (?', 
fig. 2) consists of sandy, dark, black clay, changing in some 
places to an olive-green; thickness 12 feet, probably con¬ 
siderably more, but the inferior bed was not exposed. At 
Brentwood this bed is exposed to the depth of about 20 feet. 
Upon its upper surface are found decayed septaria. Fossil 
remains are reported in this bed by the owner of the pits, but 
I have not seen or found any specimens, with the exception 
of a cast of shell enclosed in iron pyrites, which latter are 
found rather abundantly. The next in order (h) is a mottled 
grey, reddish, and fawn-coloured sandy clay, 3 feet in thick¬ 
ness, somewhat similar to the mottled clays of the Beading 
