of the Rocks of Shetland, 201 
ed. This apex of the red quartz, geographically represented 
by Snaraness, together with its separation from the contiguous 
mass of bluish-grey quartz, may be easily detected by observa- 
tions made at the point of land to which I refer, on the east of 
Kilista Voe. 
Ithly^ The strata maintaining a course from the Red Quartz 
of the Hill of Walls ^ their supposed junction with the Granite of 
Meikle Rheu being concealed by the Sea . — These strata which 
line the coast, occupy all the space in the map, bounded on the 
east by Snaraness, and on the west by the Cliffs to the east of 
the harbour at Norbie. 
Almost every thing that has been said relating to the last 
mentioned strata, will apply to the description of the present 
rocks. Exclusively of certain rocks near Busta Voe, which 
consist of gneiss associated with little or no hornblende, and of 
certain strata of gneiss to the east of Norbie, which are distin- 
guished by the excess of quartz which they contain ; — with these 
exceptions, the strata may be considered as coming under the 
character which I have given of hornblendic gneiss. They are 
traversed in the same manner by innumerable small insulated 
masses of granite ; they are occasionally diversified by the pre- 
sence of parallel strata of limestone, particularly near Busta,, 
and the direction and dip of the strata is, from such alleged 
causes, greatly confused. However, a distinct line of bearing 
may not unfrequently be detected to the north-east, and since 
the strata of gneiss, as we trace them from the south, derive 
their course from the red quartz, such a derivation being evi- 
dent throughout the whole bounding line of the quartz, they 
are probably, in the channel of the ocean, intercepted by the 
contiguous mass of granite in the Island of Meikle Rheu. But 
it is needless to add, that such an alleged termination of the 
course of these strata, which their contiguity to the granite mass, 
conjoined with the line of direction in the strata renders very 
probable, can, in the absence of palpable evidence, be only 
offered as mere conjecture. 
Sthly, TheSandstoneyPorphyritic ClaystoneyConglomerate and 
Amygdaloidal Rocks of Sandness, and the Island of Papa Stour. 
—At Eastgio, west of the coast of Walls, may be first observ- 
