264 T, M. READE ON A DELTA IN MINIATURE. 
filled to considerably above the level of the crown of the arch of the 
culvert (fig. 2) with a beautifully stratified deposit of peaty matter, 
Fig. 2.—Section in line C-D of fig. 1. 
GROUND 
Ee 
ee” 
ORIGINAL SURFA 
A, B. Deltaic deposits. C. Culvert. 
gritty sand, gravel shingle and boulders, as shown in the section 
below (fig. 3). 
Fig. 3.—Enlarged Section at E on Plan, fig. 1. 
Interlaminations of 
peaty matter A = 
yellow sand. 
= 
x SSS =r | 
———————————— s 
t 
=| +--+ Leaves of 
trees. 
Yellow gritty sand 
and pebbles of 
grit. 
eet ate 
Sand and peaty mat- 
ter. 
Deposit unbottomed. 
The layers of peaty matter and sand were generally from 7 inch 
to 1 inch in thickness, one bed of gritty yellow sand being 9 inches 
thick. 
This section was exposed by the excavations then going on to 
remove the deposit, advantage having been taken of the exception- 
ally dry weather and the lowness of the water in the reservoir. 
Part of the sand was being riddled with the object of using it in 
the filter-beds. About 5 feet thick had been removed off the whole 
area, there being still 8 feet in thickness at the mouth of the culvert. 
After consultation with the man in charge, I averaged the thick- 
ness over the entire area of 2508 yards at 2 yards. The bed of the 
Rake Brook had cut a devious course through this delta (for such 
it was), and its bed was strewn with boulders of Millstone Grit, the 
largest I measured being 1 foot across. On the northside of the road 
and in the open reservoir, marked B on plan, was another delta 
formed by the matter washed through the culvert. Five feet thick 
of this had been removed from the front of the culvert. It consisted 
principally of fine sand with a small proporticn of peaty matter 
mixed with it. There was still 10 feet deep of deposit immediately 
