1907. Hinch. — Glacial Geology of Lamb ay. 15 



All these are found in the drift of the adjoining mainland. 



From the northern line of sections the Boulder-clay extends 

 across the lower western slopes of the island, and a section 

 occurs in an old quarry near the castle. This section is over 

 two feet in thickness, and, though it thins out rapidly, the Boulder- 

 clay is exactly similar in character to the deposit on the northern 

 shore, containing travelled stones and yielding three very small 

 shell fragments. 



On the southern shore the low coast-line and the intrusion of 

 pasture have obscured the distribution, but while no shell frag- 

 ments were found, travelled stones showed that the Boulder- 

 clay was practically continuous from north to south. 



The hilly district of the centre and east of the island yielded 

 no satisfactory section of Boulder-clay, and while Mr. Praeger 

 pointed out that the walls of some of the ruined cottages were 

 formed of material which looked very like Boulder-clay, and 

 contained shell fragments, this clay might have been brought 

 up from the lower ground for the purpose. On the eastern 

 cliffs occurs a rubbly deposit which in its original condition may 

 have been Boulder-clay 1 , but at present has been so cut up by 

 the burrowing Puffins that it is impossible to come to any 

 definite conclusion about it. Shell fragments much bleached 

 may be obtained apparently in silu, but as these eastern cliffs 

 are littered with the debris of bird food, the shell fragments 

 cannot safely be used as an indication of drift. Small pebbles 

 are also to be found, to which the same drawback applies. East 

 of Gillap occurs a small patch of Boulder-clay pasted on the 

 surface of the cliff, and containing fragments of flint and sand- 

 stone, and patches of a similar nature occur two or three times 

 between Gillap and Saltpan Bay. I failed to discover glacial 

 striae in the higher portion of the island, and while it is very 

 probable, especially when we remember the condition of the 

 Isle of Man at this period, that the ice over-rode the whole 

 island, the evidence also points to this period of smothering 

 being, for the higher giound, of shorter duration 2 than for the 

 lower western portion. 



1 It will be seen (p. 7) that Mr. H. J. Seymour considers this deposit to 

 be local detritus, not derived from Boulder-clay.— Eds. 



2 Mr. Seymour informs us that he cannot agree with this opinion. —Eds. 



