508 T. C. Cantrili—Stratigraphical Note. 
Haverfordwest is situated on or near the junction of the Lower 
Llandovery Beds on the south with the Slade Beds of the local Upper 
Bala on the north. But without a complete and detailed survey of 
the ground it would have been hazardous to assign definitely any 
given locality in the neighbourhood of the junction to either Bala or 
Llandovery. Messrs. Marr & Roberts showed that at or near the base 
of the Llandovery there is a band of coarse conglomerate, succeeded by 
a grit; the former locally thins out altogether; the latter is less 
variable. The grit was described by them as exposed in a railway- 
cutting south of Shoalshook (north-east of Haverfordwest), but was 
not traced by them farther westward, into the immediate locality 
which has since yielded fossils to Mr. Turnbull. 
The recent work—as yet unpublished—of the Geological Survey at 
Haverfordwest has enabled us to arrive at the following sequence :— 
5. Green mudstones, fossiliferous, with thin grits and a group of 
sandstones. Haverfordwest gasworks. 
4. Green mudstones, softer and more shaly than 5, and compara- 
Lower tively barren. Railway-cuttings north-east of Haverfordwest 
LLANDOVERY Station. 
(part). . Shales, dark-grey and blue-black. 
3 
2. Sandstone. North-east end of railway-cutting at Cethings. 
1. Shales, dark-grey and blue-black, with conglomerate sometimes 
present within them or at their base. 
Suave Beps (Bala). Fossiliferous mudstones. 
The sandstone (No. 2) is the grit described by Messrs. Marr & 
Roberts as met with ‘‘in the railway-cutting south of Sholeshook ” 
(op. cit., p. 484). To their description we are now able to add that 
from the railway the sandstone can be traced westward to St. Martin’s 
Cemetery, which it traverses from end to end, and thence through the 
fields bounding the north side of the road which yielded Mr. Turnbull’s 
fossils. As the beds dip steeply southward it follows that the 
fossil-bed in question is in the Llandovery and not in the Slade. 
A Brachiopod band a foot or so thick is present in the railway-cutting 
at Cethings at 30 feet above the top of the sandstone (No. 2 of table) ; 
it occurs at the junction of the dark shales (No. 3) with the overlying 
mudstones (No. 4), which for some feet above the junction are 
characterized by small dark blotches. Exactly the same sequence 
obtains at the fossiliferous localities discovered by Mr. Turnbull west 
of St. Martin’s Cemetery: the sandstone yields débris in the hedges, 
and is followed on the south by black shales; these pass up where they 
reach the north side of the road into dark-green mudstones, which 
yielded the fossils, while the blotched mudstones are exposed on the 
south side of the road close by. The beds strike along the road, so 
that, all the fossils are referable to approximately one and the same 
horizon, which I estimate to lie about 250 feet above the base of the 
Lower Llandovery. 
Perhaps one of the most interesting fossils Mr. Turnbull has 
obtained from the St. Martin’s Cemetery localities is a graptolite which 
Miss G. L. Elles identifies as Diplograptus modestus, a characteristic 
Lower Birkhill form common in the Diplograptus vesiculosus zone in 
the Moffat district of Scotland. 
