323 
1878.I Superficial Gravels and Clays . 
Glacial beds at Fortune Hill,* and on the slope to the north 
I saw both the Upper Clay and the Middle Sands and 
Gravels. To the east the beds extend as far as Muswell 
Hill. 
Over the whole of this district the Upper Boulder-clay is 
spread, and conforms to the slopes of the hills, lying over 
them like a mantle. It contains most chalk fragments and 
other travelled materials on the flat-topped ridge on which 
Finchley is built, at a height of about 300 feet above the 
sea. On descending the slopes on either side the number 
* 4 - 
Gravel-pit, Church Lane, Whetstone. 
s. Surface soil. A, i. Bluish chalky boulder-clay, with rather few scattered stones. 
Red and white hard chalk, not uncommon. Slightly stratified towards base. 
A, 3. Sandy loam, with patches of chalk detritus. c. Sand and sandy subangular 
gravel, with many rounded tertiary pebbles. 
of included stones and of chalky materials rapidly dimi- 
nishes until it becomes a brown clay, containing only a few 
scattered pebbles. Mr. Whitaker records a great thickness 
of brown clay near Finchley Church, which, although it 
contains no boulders, he recognises as boulder-clay. f In 
the various sections I have examined, all the steps are to 
be seen in the gradation from a clay packed with travelled 
stones up to that in which only a pebble is to be found here 
and there. It is the non-recognition of the latter form of 
the deposit as a glacial clay that has led to the supposition 
that the Upper Boulder-clay is confined to the tops of the 
hills, and does not extend down their slopes. 
* Proc. Geol. Assoc., 1873, vol. iii., p. 30. 
t Guide to the Geology of London, 1875, p. 55. 
Y 2 
