76 DRT. J. JEU ON 
mantle of stony till, but good sections are rare. The sections of drift exposed — 
on the coast between Strumble Head and Cardigan are not so good as those seen west 
of Strumble Head, but where seen they are of the usual character. 
Inland, good sections are not often met with. Much of the country in the 
neighbourhood of St David’s is covered by drift, which consists of a sandy matrix full 
of boulders. But often the matrix is clayey, as may be seen in sections on the 
roadside near Castell, south-west of St David’s, and again in a pit just off the road 
near Pont Clegyr, two miles east of St David’s. In fact a large part of the country 
south-west of Strumble Head is covered by material which has been to a large extent 
re-arranged, and which cannot be defined accurately either as boulder-clay or as sand 
and gravel, though the tendency is for the sand and gravel to become more marked at 
a depth of a few feet from the surface. Much rubbly-drift, becoming more sandy 
as traced downwards, is spread out on Strumble Head, especially on the moorland above 
Goodwick. The sands and gravels occurring south and east of Fishguard Bay are, as 
already mentioned, usually overlain by a few feet of rubbly-drift or more typical stony 
boulder-clay. In the railway cutting between Tregroes moor and Manorowen 7 feet 
of stiff yellowish-brown boulder-clay is seen covering the shelly sand. This clay is 
spread out over much of the high land skirting the railway here on the west side. 
A little further south the sands and gravel die out, and the Upper Boulder-Clay seems 
to lie directly on the Lower Boulder-Clay, and this occurs possibly in the boring at 
Tre-bython already referred to, where yellowish clay is succeeded by tough bluish clay. 
It is very rarely that one has an opportunity of finding all the deposits succeeding 
one another in the same section, and of ascertaining the depth of each. But the engineer 
of the Great Western Railway at Goodwick supplied the author with particulars of the 
boring made in the railway cutting between Tregroes Moor and Manorowen, just about 
Cnuc Sandy. <A complete section of the railway cutting, together with the results 
obtained by boring, are given on the next page. From above downwards, the deposits 
passed through were— 
(4) Stiff yellowish-brown clay with fragments of slate-rock : ; : . 7 feet 
(3) Fine yellow sand with shell-fragments : - : : 2 ~. LO 
(2) Stiff dark-blue boulder- ine with shell- Beaman: ; 6 : : Beaks) * 
(1) Gravel , . - 
Rock 
This section proves very clearly the presence of an Upper and a Lower Boulder-Clay. 
These are separated here, as in many other places, by a deposit of sand. Most of the 
Lower Boulder-Clay is below the surface of the railway cutting. And a glance at the 
section shows that before the cutting was made, the surface of the ground was covered 
to a depth of 7 feet by the Upper Boulder-Clay. So it is quite possible that the Lower 
Boulder-Clay spreads over a much wider area than is evident at the surface, and that 
much of it is hidden by more superficial deposits. It is interesting to note that 
underneath the Lower Boulder-Clay there lies 5 feet of gravel. On comparison this was 
