366 B.N. Peach Sf J. Home — Glacial ion of the She f lands, 



line is coincident with a well-marked hollow, which is due to the 

 fact that the soft schists which dip beneath the serpentine have 

 succumbed more readily to the denuding agencies, thus causing 

 the serpentine to weather backwards as a steep escarpment. In 

 short, the steep rock slope dates from Pre-glacial times. Further, 

 the whole of that steep declivity is glaciated, but not more so thau 

 the east or south-east slopes or the tops of the hills. The whole 

 ridge is moutonnee, and after careful searching the only striations 

 noted by us occur on the east and south-east slopes pointing W. 8°- 

 10° S., nearly parallel with the long axis of the ridge. Mr. Peach 

 inferred that the ice moved southwards from the hills lying to the 

 north of the Heogs, evidently referring to the hills round Saxavord, 

 till it abutted against the steep rock slope and was deflected east- 

 wards into Haroldswick Bay. But such a supposition does not ex- 

 plain the glaciated appearance of the tops of the Heogs or the striae 

 running parallel with the ridge on the south-east slope. Moreover, 

 it is directly disproved by the trend of the strise on the eastern 

 sea-board north of Haroldswick Bay. On the cliff top of the 

 Kivv Hill, at a height of 500 feet by aneroid measurement, we 

 found striae pointing W. 10° S. which, it may be observed, are iden- 

 tical with those on the south-east slope of the Heogs. Again, near 

 the village of Norwick the trend is W. 20° S. Both of these localities 

 are situated immediately to the east of the line of the supposed 

 movement from the hills lying to the north of the Heogs. We shall 

 point out presently, that the westerly movement indicated by the 

 strise on the Nivv Hill and at Norwick is placed beyond doubt by 

 the dispersal of the stones in the Boulder-clay ; but we will now 

 quote the various examples of striated surfaces noted by us in Uust 

 in order to show that they clearly indicate a uniform and persistent 

 movement across the island in a W. and W.S.W. direction. 



W. 20° S. On shore near Norwick Old Chui-ch, near Norwick Bay. 



W. 20° S. On extreme south-east point inclosing Norwick Bay — East coast. 



W. 10° S. On shore, top of cliff 500 feet high, Nivv Hill ,, ,, 



"W.^ North shore of Haroldswick Bay. ,, ,, 



"W. Haroldswick Bay. , , „ 



W. 10° S. On shore, top of clifE, north side of Swina Ness. ,, ,, 



AV. 10° S. On shore, south side of Swina Ness. ,, ,, 



W. 10° S. Near previous locality. ,, ,, 



"W. 8° S. East slope of the Heogs. 



W. 10° S. South-east slope of the Heogs, above road leading to Hagdale. 



W. 10° S. In burn near buness House, Balta Sound. 



W. 10° S. On shore near Hammer, Balta Sound. East coast. 



"W. 5° N. On shore at south entrance of Balta Sound. ,, 



W. 20° S. On shore opposite Balta Sound. ,, 



"W. 12'" S. On shore opposite north end of Huna Island. „ 



W. On shore opposite south end of Huna Island. ,, 



"w! 6° S. East slope of Vord Hill. 



W. 20° S. On shore north of old Castle of Muness. East coast. 



S. 42° "W.I Cross-hatches, on shore east of Muness hamlet, south-east promontory 



W. 4° S.) of Unst. 



1 As there was a strong local deflection of the compass amounting to about 25° at 

 this point, the proper direction of these striations was obtained from a party of 

 the Ordnance Survey, who were at work near the spot at the time they were noted. 



