LOWER LIAS: DUNEAVEN. 109 
It will be noted that beneath the ordinary limestones of the 
Lower Lias, we come to, first, a series of hard and more or less 
conglomeratic limestones that yield Lima gigantea, L. tuberculata, 
and other fossil?. These are from 12 to 14 feet thick. They rest 
on a series of bluish-grey and pale grey limestones, more massive in 
appearance, that pass down gradually into the white conglomerate. 
In the upper part of this lower series, which is mainly bluish- in 
colour, we may note the horizontal change of a compact blue lime- 
stone into pale-grey stone of the character of Sutton Stone, 
showing that the test of colour is one not to be entirely depended 
upon. This moreover is shown by the fact that the lowest bed of 
conglomerate, beneath the white Sutton Stone and conglomerate, is 
here and there decidedly blue. Moreover, some of the compact 
blue limestones yielding Pecten suttonensis, present characters 
resembling the highest beds noted in the section at Pant-y-Slade, 
beds which there and elsewhere along the coast, form a sort of 
passage from the white Sutton Stone upwards into the blue con- 
glomeratic Southerndown Beds. 
It is clear that wherever the base of the conglomeratic series is 
exposed, we find the white Sutton Stone and conglomerate (of 
varying thickness) resting on the Carboniferous Limestone. 
No attempt is made to correlate particular beds in the Southern- 
down Series of Dunraven with those under Southerndown, because 
of the blending of these divisions, and the absence of any 
definitely marked lithological or palseontological horizons. 
Undoubtedly the pale creamy and white colour of the Sutton 
Stone and conglomerate, has led to the supposition that the beds 
represent the White Lias. In texture however the Sutton Stone 
differs very much from that rock. It should moreover be noted, 
that at Penarth the White Lias is represented mainly by grey 
shaly marls, 12 feet or more in thickness, and does not exhibit a 
mass of compact white limestones such as we find in Somersetshire. 
Again at the Stormy Cement Works, between Bridgend and Pyle, 
the White Lias is but feebly developed, and its probable represen- 
tative is overlaid by a thin bed of conglomerate that occurs at the 
base o the Lower Lias. In other localities in this district, as 
observed by Bristow, the Rhsetic Beds are exhibited in close 
proximity to the conglomeratic Lias. Bearing in mind the fact 
that in places the Rhsetic Beds merge almost imperceptibly into 
the Lower Lias, it would perhaps be wrong to state dogmatically 
that no portions of the White Lias are represented in the con- 
glomeratic Lias of South Wales ; but we have no evidence that 
this is the case. No specimens of Cardium rh&ticum, or Lima 
precursor have been obtained, but the fossils that do occur include 
species elsewhere obtained from the basement- beds of the Lower 
Lias. 
Modifications of the Lower Lias have been noticed elsewhere 
on Broadfield Down and near Shepton Mallet, where the strata 
rest in similar situations on the Carboniferous Limestone. The 
beds and the fossils found near Shepton Mallet are so like those 
