84 Proceedings of the Boyal Physical Society. 



area during the deposition of the successive members of this 

 formation. 



Eeturning to the shore section north of East Quarff, we 

 find a gradually ascending series from the Brenista flags 

 to certain coarse conglomerates seen in a small stream 

 at the head of the bay of Gulberwick, which are totally 

 different in character from the breccias already described. 

 The included pebbles are well rounded and are to a large 

 extent composed of different materials from the basement 

 beds. These beds are traceable up the slope of the Gulber- 

 wick hollow to the road between Lerwick and Scalloway, 

 where they form crags on the hill face. They are also trace- 

 able across the hills northwards to Eovey Head, about two 

 miles north of Lerwick, where they are thrown against the 

 metamorphic rocks by a fault which is well seen on the shore. 

 From Rovey Head southwards to the ridge overlooking the 

 head of Fitch Dale, this fault forms the boundary line between 

 the metamorphic rocks and the conglomerates. It follows, 

 therefore, that the underlying Brenista flags and the base- 

 ment breccia have been thrown out along this line. 



Again, on the shore south of Eovey Head, and to the east 

 of Gulberwick, the Eovey Head conglomerates are succeeded 

 by a thick series of coarse sandstones, passing into pebbly 

 grits, with occasional conglomeratic layers. These have been 

 termed by us the Lerwick sandstones, because they are most 

 strikingly exliibited in the neighbourhood of the capital of 

 Shetland. 



The patches of Old Eed Sandstone rocks which occur 

 between Ocraquay and Aith's Voe, and between Sandlodge 

 and Hoswick, are faulted against the metamorphic ?.'ocks, as 

 described by Professor Geikie and Dr Gibson. The strata in 

 these isolated areas, as well as in the island of Mousa, belong 

 to the series of the Brenista flags. Near the fault they are 

 highly inclined, but at some distance from it they dip towards 

 the south-east, at angles varying from 15° to 20°. The well- 

 known veins of copper and iron ore at Sandlodge, which 

 we had ample opportunities of examining through the kind- 

 ness of Mr Walker, occur in these rocks. 



Again, at Levenwick, the fault is seen on the shore, which 



