SILURIAN ROCKS OF NORTH WALES. 145 
the river to Blaen-y-cwm, where a thin bed of Conglomerate 
“at its base rests on the Bala Beds. 
The lower part of this series, to which the name Lower 
Llandovery was assigned, must certainly be bracketed with the 
upper part, which was called Upper Llandovery, instead of 
connecting it with the Upper Bala, and there does not seem to 
be any reason why the name May Hill, originally given to the 
series by Professor Sedgwick, in 1852, should be superceded by 
the newer term Llandovery. 
If we now travel west and examine the Silurian Rocks where 
they come up again from below all the Merthynian or Lower 
Old Red, we have an opportunity of seeing how they behave 
when deposited near a shore of Archzan and Cambrian Rocks. 
The highest beds are well seen close to Ledbury Station, and 
a still better section may be examined in the deep railway 
cutting through the Northern extension of the Malvern Hills, 
near Knightwick, on the Worcester and Bromyard Line. 
Without going into details we may point out that in both 
these sections there is a clear transition from the Silurian up 
into the Merthynian or Lower Old Red and the fossils of the 
Ludlow Rocks Chonefes lata, Lingula cornea, and an elongated 
variety of the Lingula are found where beds showing Ludlow 
conditions of sedimentation recur in the lower part of the 
Ledbury shales. Although there are thin-bedded sandstones, 
the tilestones of Section A are not found in this district. The 
Hay Sandstone, however, is represented by the Downton 
Sandstone, and the Ludlow Shales are distinctly divided into two 
by a thick limestone characterised by a new Pen/amerus— 
P. Knightii ; and on the horizon of the Cae Sara Limestone, of 
Carmarthenshire, the Wenlock Limestone occurs in this Section 
(B.) The Wenlock Shale is the same in both, but, at its base 
we find in the Hereford Section another limestone which 
might well be described as the Lower Wenlock Limestone. 
This has, however, been named the Woolhope Limestone from 
the town where it is most developed. On the horizon of the 
Tarannon Shale there are generally red or pale pasty beds of 
shale, but we must not assume that these are strictly synchronous 
as the fossils of this horizon are of very irregular occurrence 
and point to very rapidly fluctuating conditions. However, at 
about the nght place in Eastnor Park, near where the Gullet 
Wood Road turns towards the Obelisk, there is a red rock which 
by its fossils we should bracket with the Upper May Hill 
Sandstone. 
Below this comes the May Hill Sandstone with Pentamerus 
oblongus and Siricklandinia lens, occurring together down to 
the very base at West Malvern and the Wych, but in Gullet 
Wood having a series of olive-grey fossiliferous sandstones 
with Merisfella crassa running down the Gullet, East of the 
park boundary gate, and much further than is indicated on the 
geological survey map. 
