in the Shetland Islands. 343 
clearly of the grinding to which they had been subjected. Ruts and 
 striz, &., are also rare here: they, however, occurred to me on the 
cliff at Haldale, in Haroldswick Bay, in a recently bared rock, 
underlying a thick deposit of drift, in which rounded and striated 
stones and blocks were plentiful. The whole of the- serpentine 
enclosed in the drift shows the small pieces of chromate of iron it 
contains, standing up beyond the matrix, thus proving the rubbing, 
and that this mineral is very generally diffused throughout the 
whole of Unst. The direction of the ruts, &c., is nearly WNW. 
and ESE. The hills of the Muckle and Little Heogs lie to the 
north of this spot (Haldale), and a slope from about 20 feet above 
the level of the sea rises gradually hence to the top of the Muckle 
Heog, to the height of at least 500 feet. In this slope lies the famed 
chromate of iron quarry or mine. On reaching the top of this hill, 
I found the WNW. end vertical, and polished to the depth at least 
of 150 feet. The hill beyond slopes towards it. This storm side 
had evidently resisted a portion of the destroying force, and turned 
it on its western flank, and thus it swept down the valley towards 
Haroldswick Bay, as is evidenced by the greater destruction there than 
on the Eastern side towards Balta Sound. The scene from the top 
of the Muckle Heog, when looking towards Haroldswick, and then in 
the direction of Burrafiord, is one that tells of mighty agents, long 
continued, powerful to crush and grind;—so powerful, that the really 
hard and massive hills of serpentine have been ploughed down and 
removed to below the sea-level in places near Haroldswick. The 
sea has since piled up a beach on these spots, through which the 
water percolates from the low peaty soil at the back, at each reces- 
sion of the tide. All over Unst the rocks show traces of abrasion; 
and in many places deposits of drift occur, enclesing stones of all 
sizes, some of which are rounded and striated. I mention a few of 
the places where I got drift, so that anyone desirous of seeing it 
may visit them. First, Haldale; at Hammer on Balta Sound; the 
Haunted Burn of Waltea, between Balta Sound and Ueay Sound, 
and at the latter place on the sea-shore. On the south side of the 
small island of Ueay, a similar deposit underlies a sandy raised beach, 
which encloses pebbles, whelks, oysters, and other sea-shells; with 
fish-bones in abundance. Large perched blocks—some many tons 
in weight—lie scattered about everywhere. In none of the glacial 
deposits did I find a single organism. 
Thus, then, at both ends and the middle of this interesting group 
of islands, traces of glacial action were found. I must, however, 
leave the filling-up of the intervals to others. From the contour of 
the islands, seen as we eoasted along them, the whole appear to 
have been subjected to similar agencies. 
HI. A Wak over THE ‘ AsH-BED’ AND ‘BALA LIMESTONES’ 
NEAR OSWESTRY. 
By D. C. Davies. 
i was a dull December morning (but my companion and myself 
are no mere ‘ parlour-geologists’) when we were bound for the 
Limestones and ‘'Trap-rocks’ which lie about the valley of the 
