22 



T. F. Jamieson — Raised Beaches of Scotland. 



of clay immediately behind it, and behind and above both a tumbled 

 mass of glacial beds, separated from the chalk by a thin layer of 

 dark laminated clay. 



Diagram of Chalk Bluff, showing the mass of clay immediately behind it and the 

 - ■ discontinuous line of chalk masses round the Bay. 



Towards the end of 1903 the grey bed which had been exposed 

 at the top of the bluff began to throw out a 'stringer' (or broken 

 horizontal line of grey chalk) over the mass of clay behind it, and 

 early in 1904 there was a discontinuous line of chalk masses visible 

 for a considerable way round the bay. They were apparently 

 supported by a mass of clay, which was turned under itself against 

 the bluff, judging from the banding of the clay as sketched very 

 roughly in the above diagram. 



EXPLANATION OF PLATES. 



Views of Trimmingham Chalk Bluffs, Norfolk Coast. 



Plate II. 

 Fig. 1 . — South Bluff ; gap between northern and southern part, a, a, masses of 



coarse shingle. 

 Figs. 2 and 3.— Two views of North Bluff as seen from the south (1901). 



Plate III. 

 Fig. 4.— North Bluff; view of north bay (January, 1901). 

 ,, 5. — Pinnacle of clay separating the North Bluff from the chalk at the back 

 of it (January, 1901). The connecting roof of chalk is in deep shadow, 

 and therefore very indistinct. 

 ,, 6. — View of the North Bluff and the exposure of chalk in the bay (November, 

 1904). 



(To he continued.) 



ni. — On the Kaised Beaches of the Geological Survey of 



Scotland. 



By T. F. Jamieson, F.G.S. 



N the maps and memoirs of the Geological Survey of Scotland 



I 



there is frequent mention of raised beaches at 50 and 100 feet 

 above the present sea - level. Mr. James Geikie, too, in his 

 well-known book on the Great Ice Age, confidently assumes the 

 existence of beaches at these two levels. It is therefore with some 

 degree of reluctance that in the following remarks I venture to 

 question the reality of these supposed beaches ; but it will lessen 

 the field of controversy if I confine my observations to the east side 

 of Scotland. Matters may probably differ somewhat in regard to the 

 west side. 



