Fig. 2.—Diabase with pillowy structure ; south-west of Bryn Llwyd, 
Newborough sand-hills, looking east-north-castward. 
Fig. 3.—Jasper filling interspaces of pillowy diabase ; Cerig Mawr, 
Newhborough sand-hills, looking northward. 
For the photographs 
from which the above figures are reproduced, I am indebted to Mr. J. Trevor- 
Owen, Headmaster of the Grammar School, Swansea. | 
[The handle of the hammer rests against a mass of jasper. 
