19 
In 1867, Mr. Bonney ( Geol. Mag. iv. 289) noted 
a deposit of shells near Gwydfyd farm, in clay 
which appeared to him “ not to have undergone 
much denudation during the process of upheaval.” 
Mr. Maw had stated, Geol. Mag. iv. 377, his con- 
viction that Mr. Bonney’s shells had been deposited 
by man. Mr. Darbishire pronounced the shells of 
the red clay with angular fragments also to be of 
non-marine deposit. These latter shells are of the 
species My tilus edulis, Cardium edule, Ostrea edulis, 
Patella vulgata, Littorina littorea, Purpura Capillus, 
and Buccinum undatum. These occur either 
massed in heaps or layers (generally of one or two 
kinds together) or more sparsely distributed. They 
are all of species eaten by birds or man. All the 
specimens are full grown, or at least of edible size, 
and in nearly every instance whole, the exceptions 
being Mytilus, a shell peculiarly liable to disinte- 
gration, and the univalves, which sometimes occur 
broken about the mouth, as if to allow of extrac- 
tion of the animal. There are neither any other 
species nor young specimens of what do occur. 
The shells do not appear as if deposited under any 
natural original conditions, nor, if they were so, 
does it seem likely that they would have remained 
during a slow elevation through the tides of ages. 
The fact of elevation is undoubted, but these shells 
are no evidence of it. 
It is not necessary to give separate lists of the 
lots found at successive heights. They occur on 
all sides of the Head, but have been especially 
collected in the old road valley, and on the Hen- 
dafarn road towards the south-east. Along this 
district they have been noted at 120, 140, 180, 
200, 300, and 315 feet above the sea. On the old 
road section, Mr. Darbishire had found the shells 
