652 B. N. PEACH AND J. HOENE ON THE 



varies from W. 10° N. to W. 10° S. ; at Hussitaing, W. 20° S. ; near 

 the Eed Hare, W. 10° S. ; near Inganess, W. 15° S. to W. 18° N. ; 

 and again, in the bay south of Inganess, a well-marked instance 

 points W. 12° I^. 



In some parts of the island of Eda the proofs of glaciation are 

 marvellously fresh, more especially on the surfaces of the harder 

 sandstones. From the finely glaciated surfaces and numerous roches 

 moutonnees in the centre of the island north of Lonton it is 

 evident that the ice must have overtopped the hills in its north- 

 westward march. On the east slopes of the Stennie hill the direc- 

 tion of the strige is W. 20°-25° JST., and not far to the south 

 W. 40° N. 



Along the eastern coast, between Calf Sound and Lonton Bay, the 

 ice-markings point N. 20°-30° W., while between the Kirk of 

 Skail and the Veness promontory the average direction is W. 35°- 

 40° 'N. In one remarkable instance, on the shore about a mile to 

 the south of the Kirk of Skail, striae were observed on a highly 

 inclined rock-face trending north and south, while on the cliff-top 

 the direction is W. 35° ]N"., the former being evidently due to local 

 deflection. Along the western coast the general direction of the 

 ice-movement is in perfect harmony with that just described. In 

 the neighbourhood of Warness, which forms the south-west pro- 

 montory of the island, the trend is W. 13° N., while to the west of 

 the Wart of Eda, on the cliff-tops, it varies from W. 28° N. to 

 W. 43° N. ; and again, to the north of Seal Skerry, W. 40° N. One 

 of the best examples to be met with in the island occurs in the bay 

 east of Fara's Ness, where a small stream enters the sea. This burn 

 has cut down through a deposit of shelly Boulder-clay to the 

 polished pavement on which it rests ; and along the stream -course 

 the firm lines produced by the ice-chisel may be seen to advantage 

 on the glaciated surfaces of the sandstones. The direction of these 

 instances is N. 27° W., but on the shore, close by the mouth of the 

 stream, the trend is W. 38° N. 



Notwithstanding the widespread covering of blown sand which 

 envelops the greater portion of the island of Sanda, we succeeded 

 in finding abundant traces of the ice-movement. In the Burness • 

 peninsula striated surfaces are numerous along the coast-line, about 

 a dozen instances occurring between Hermaness Bay and the Holms 

 of Eyre, which, with one or two exceptions, point W. 10°-15° N. 

 To the west of Loch Roo the direction is W. 25° N. ; and not far 

 from the Saville boulder, on the eastern shore of the peninsula, the- 

 trend is N.W. 



On the shores of Kettletoft Bay the average direction is W. 10°]^. ; 

 inland from this bay towards the Free Church it varies from 

 W. 20°-40° N., while in Bacaskeal Bay it is N. 32° W. ^ This 

 north-westerly movement is equally borne out by the evidence 

 obtained in the southern part of the island ; for in the bay west of 

 Hack Ness the ice-markings point N. 30° W., and on the western 

 shore between Spur Ness and Stranquoy N. 8°-17^ W. 



The island of Stronsa likewise supplies conclusive evidence 



