296 REY. J. F. BLAKE ON THE 
the following view may be seen (fig. 2). Here the conglomerate, 
which passes up into grey sandstone and has none of the intercalated 
tuff-like material which is found in the next westward cove, lies on 
Fig. 2.— View west of Nun’s Chapel, looking west. 
Soft ash. Hard ash. 
Felsite. 
Conglo- 
merate. 
Sand- 
t 
Bt ag Coarse 
ash. 
AK 
Porcel- 
lanite. 
a mass of tuffs and ashes, some of which are indurated by siliceous 
infiltration into the “ porcellanites,” and others have intrusions of 
the spherulitic felsite. The line of junction, which is perfectly clear 
on the shore, is actually a faulted one, the conglomerate coming 
against and being entirely cut out by the ashes at that particular 
spot ; and these latter seem to increase in thickness as they pass up 
the cliffnext tothe former. Such a fault, standing alone as evidence, 
would, I admit, be of very little consequence; but it is eertainly 
satisfactory to find that in one of the very few places where a knife 
can be passed between the surfaces of junction, that junction is a 
fault. It is not, however, on the character of such isolated spots 
that the relations of two series are to be judged; but we must 
inquire whether they cling to each other or not as they are traced 
across the country. 
Now we know that to the west, at Porth Clais, the conglomerate 
itself is cut out, all the ashes have disappeared, and the granite comes 
