16 N. F. Robarts on the Plateau Gravel, Upper 
Chalk-downs that we find the best exhibition of this Southern 
Drift. A thin bed of it resting on London Clay caps West-Ho 
Hill, Norwood. The following is a detailed section taken some 
years since :— 
a. Surface soil... Ss 
b. Loamy gravel 7 sis we 
c. Fine ochreous gravel, with veins of 
grey sandy clay 
. Grey sandy clay 
Yellow gravelly sands 
. Grey sandy clay 
. Ochreous sand 
. Grey sand ... _ 
Coarse ochreous gravel 
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COWWDODSO 
According to one specimen I kept, this gravel consists of :— 
1. Subangular flints, unstained and stained brown, in largest 
proportion. 
2. A considerable proportion of Tertiary flint pebbles, some 
broken and worn. 
3. About 10 per cent. of subangular fragments of chert and 
ragstone. 
With one pebble of a hard sandstone or quartzite (Tertiary ?), 
and one small pebble of quartz. 
This gravel extends southward all along the top of this hill at a 
height of 360 to 380 ft. above O. D,” 
Now to describe the section in question. 
On South Norwood Hill, at a little below 850 ft. above O. D., 
the gardens on the east and the bank on the west side of the road 
are seen to contain a considerable number of pebbles and sub- 
angular flints, some of the latter being stained brown. 
Below 350 ft. above O. D. the trench, after passing through 
one to two feet of made soil, was in solid London Clay, but, on 
reaching the notice-board giving warning to cyclists opposite to 
‘Court Royal,’ the clay had a mottled appearance, and if seen 
by itself might readily have been taken for a clay of the Reading 
beds; this was followed to the north in the lower half of the 
cutting by about 30 ft. of irregular grey gravel, 9 ft. of yellow 
clay, 6 ft. of yellow and grey gravel, 6 ft. of sandy yellow clay, 
9 ft. of yellow clayey gravel, followed by sandy yellow clay up to 
the gate of ‘Thornaby’; then 25 ft. grey clayey gravel, 10 ft. 
clay, 7 ft. small sandy chalky gravel, 10 ft. clay; then, at the 
corner of Grange Hill, about 50 ft. yellow clayey chalky gravel, 
made up entirely of small Tertiary pebbles, with a very few large, 
and hardly any of intermediate size, with some subangular flints, 
