306 LIAS OF ENGLAND AND AVALES : 
Tawney estimated the thickness of the Southerndown Series 
in this section at 50 feet ; so that our measurements well agree. 
In the south-eastern angle of the bay, on the western side of 
Witches Point, there is a fault and much disturbance of the 
strata. The Lower Lias limestones and clays on the north, are 
brought abruptly against the conglomeratic beds of Lias, the 
Sutton Stone and conglomerate, and the Carboniferous Limestone 
on the south : and the downthrow on the north must amount to 
about 100 feet. The beds on the northern side of Witches Point 
are for the most part inaccessible, but their general arrangement 
may be studied from the shore. The White conglomerate is 
seen to rest irregularly, and with valuing thickness, on the 
Carboniferous Limestone, which here contains many nodules and' 
lenticular bands of chert, and exhibits an undulating anticlinal 
structure. (See Figs. 45 and 46.) Beyond the Witches Point the 
FIG. 46. 
Section near tJte Witches Point, Dunraven, Glamorganshire. 
(De Ja Beche.) 
c Southerndown Beds. 1 L LJ 
b, Sutton Beds. f 
a. Carboniferous Limestone. 
beds are more accessible at low-tide, and here the Sutton Stone 
inosculates with the older rocks, having undercut it in places ; a 
feature also observable near Sutton. 
The main mass of white stone and conglomerate forming 
massive beds, here occurs at the base, as in the cliff at Pant-y- 
Slade ; it is from 20 to 25 feet thick, but above are nearly 20 feet 
of blue, bluish-grey, and pale-grey limestones that contain the 
same fossils and cannot be separated from the Sutton Series. 
Higher still, we can just trace the more decidedly bluish-limestones, 
more or less conglomeratic (Southerndown Series), that underlie 
the ordinary beds of Lower Lias. 
Along this part of the coast the sequence is interfered with 
by an occasional dislocation of the beds. On the eastern side 
of Witches Point there is a cavern, excavated in the white 
Sutton Beds which rest on the Carboniferous Limestone. The 
basement Sutton conglomerate contains fragments of chert, and 
pebbles or boulders of Carboniferous Limestone. It is here 
9 feet thick, and is overlaid by about 18 feet of pale limestones 
more or less brecciated. We are unable to trace the sequence 
