XXVI 
PEOCEEDINGS OE THE 
Before the line arrives at this point there is a shallow cutting, 
and almost immediately beyond it there is a much deeper cutting, 
both being in the London Clay. A little further on the basement- 
bed is exposed, having the usual bed of flint-pebbles very largely 
developed; and then, near Goose Green, just beyond the highest 
point, which is about 260 feet above the sea-level, the Woolwich 
and Reading Beds crop out under the escarpment of the London 
Clay. A small stream rises here and has had to be diverted almost 
from its source to allow of the line being carried in the direction 
of its bed nearly to the point where it flows into the River Colne. 
The line now emerges from the cutting, being continued to Rick- 
mansworth on an embankment. 
At this point, where the cutting ends, the line runs through 
a wood. Taking advantage of the shade afforded, for it was a hot 
sunny day, the Director gave a brief outline of the geology of the 
district which had been traversed, in the course of which he said 
that the chief point of geological interest was the inlier of the 
Woolwich and Reading Beds which occupies a considerable area 
of a very irregular outline around and for a mile or two west of 
the village. There appeared to have been a slight elevation of 
the Tertiary beds under Pinner (as shown in the section) ex¬ 
tending for some distance in a line roughly parallel with the 
escarpment of these beds. Owing to this elevation and the 
lowering of the ground by the denuding action of a small stream, 
the course of which has probably been mainly determined by a 
line of weakness or breaking across of the strata caused by the 
elevation, the Reading Beds have been laid bare, appearing on the 
surface surrounded by the main mass of the London Clay. This 
“ Pinner Inlier,” as had been pointed out by Mr. Whitaker,* is 
in a line of elevation running from Windsor to Horthaw, and 
giving rise to the Chalk hill on which Windsor Castle stands, 
and to the “ISTorthaw Inlier” of the Reading Beds and the Chalk. 
About three miles to the north-west of this line of elevation is 
the Tertiary escarpment, and again a few miles to the north-west 
are a number of Tertiary outliers on the Chalk ; the inliers, the 
escarpment, and the outliers being probably due to slight changes 
in the dip of the underlying Chalk in approximately parallel lines 
running south-west and north-east, such as would be caused by 
a crumpling of the strata by compression exerted in a north-west 
and south-east direction. 
The line was left at Moor Park Farm, and the members of the 
two Societies walked by Hamper Mills, where the Colne was 
crossed, to Watford. At Watford House Dr. Brett entertained 
the party, tea and other refreshments being partaken of, and his 
collection of fossils, etc., being inspected. The Platts, the residence 
of Mrs. Bishop, was next visited, and an extensive series of minerals 
and fossils collected by her was examined with much interest. 
* ‘ Geological Magazine,’ vol. iv, p. 487. 
