283 
1911-12.] Report on Rock Specimens. 
and five portions of separate rounded pebbles of coarse pebbly arkose of 
the Cape Wrath type of the Torridon sandstone. Specimens Nos. 3 and 4 * 
are granular flaggy biotite-gneiss with some hornblende, representing the 
acid portion of the fundamental complex. No. 1 is a dark grey granular 
medium-grained hornblende-gneiss with very dark hornblende, more 
abundant than the interspersed felspar and quartz, and is from one of 
the more basic bands. No. 6 consists of four fragments of a coarse-grained 
dark rock made up of dark hornblende and a very black biotite (haugh- 
tonite), evidently from one of the characteristic “ basic knots ” ; some of 
the pieces have giant quartz and felspar on their edges, evidently portions 
of pegmatite veins, both of which are common at Cape Wrath. No. 5 is 
a granular or granitoid biotite-gneiss or granite, of which No. 7 is a 
coarser-grained variety with some hornblende. These probably represent 
granites injected into the original fundamental complex but which are now 
incorporated along with it to make up the Cape Wrath type of the Lewisian 
gneiss. Specimens numbered (2) consist of four portions of blocks of 
reddish-brown felspathic sandstone or arkose (Torridonian), from 2 to 4 
inches in greatest diameter. Two of the pieces are ice-moulded or 
glaciated ; the others are portions of rolled blocks. No. 8 is a rounded 
pebble of coarse grit or fine conglomerate containing pebbles, many of 
which are of the red spherulitic felsite, a common feature of the Torridon 
conglomerates of the Cape Wrath region. These Torridonian fragments 
are evidently not in situ. They need not have come from the mainland, 
but may have been derived from an under-sea extension of the Torridon 
rocks of Cape Wrath. 
H.M.S. " Knight Errant.” 
Station 2. 28th July 1880. 
Lat. 60° 29' N., long. 8° 19' E. ; depth 375 fms. 
. The material from this station on the Wyville Thomson ridge consists 
entirely of stones, about forty in number, ranging from 1 inch to 12 inches 
in longest diameter. 
Most of the stones are glaciated, some of them distinctly striated, some 
subangular with angles rubbed off (ice-moulded), while a few are rounded. 
Only some of the larger stones show traces of having been partially 
embedded in a fawn-coloured sandy boulder clay. The greater number 
are more or less covered all over with polyzoa, serpulge, and sponges, as if 
they had lain on a hard bottom or loosely piled upon each other. Their 
* The numbers refer to the Knight Errant collection only. 
