490 THE FRESH-WATER LOCHS OF SCOTLAND 
Benisval. — Rock-basin in Lewisian Gneiss. 
Beoraid. — Valley rock-basin in granulitic schists and muscovite-biotite 
gneiss in valley drained by the river Meoble, along which ice flowed 
from the head of Loch Eil into Loch Morar. 
Bhaid Daraich^ a'. — Hollow in Lewisian Gneiss^ the barrier consisting 
in part of raised-beach material. It is probable that the bed of 
the loch is a rock-basin which was occupied by ice during the 
deposition of the beach. 
Bhaid Luachraich, a'. — Irregular rock-basin in Torridon Sandstone, 
partly ponded by drift. 
Bhaillidh^ a'. — Minor rock-basin studded with moraines on the course 
of the Leven, now covered by the water of the great dam for the 
Leven Power Works. 
Bhainne, a'. — Lochan in schist ponded by drift. 
Bharpa^ a'. — Rock-basin in Lewisian Gneiss. 
Bhealaich, a' (Alsh basin)^ or Loch of the Pass. — Rock-basin in granulitic 
schists on pass at head of the Glomag — practically on the watershed 
between Strath Affric and the Elchaig^ over which ice streamed 
from the east during the maximum glaciation and the subsequent 
confluent glacier stage. It is one of a series which almost invariably 
occur where ice has passed over a low watershed in a through valley. 
Bhealaich^ a' (Gairloch basin). — Rock-basin situated in valley^ open at 
both ends. The loAver end of the loch lies upon the Lewisian Gneiss, 
while the upper end is bounded on both sides by the overlying 
Torridon Sandstone. The valley throughout the greater part of the 
glacial period acted as an outlet for a greater volume of ice than 
could have been obtained from its own catchment basin, and the 
basin occurs just where the ice must have been most constricted. 
Bhealaich, a' (Naver basin). — Rock-basin in granulitic schists. Situated 
in valley open at both ends, which became one of the outlets for the 
ice radiating from the cauldron of Central Sutherland during the 
maximum and confluent glacier stages of the glacial period. It is 
merely the upper portion of Loch Coir' an Fhearna. 
Bhradain. — Rock-basin in Moine schist. 
Bhraoin^ a' — Rock-basin in granulitic quartz-biotite schists, in part 
determined by the line of shatter-belt of the Fasagh fault. 
Bhuird, a'. — Rock-basin in Lewisian Gneiss. 
Bi, NA. — Lies on an open pass on the watershed of Scotland, where the 
Lochy, a tributary of the Orchy, had appropriated the head-waters 
of a branch of the Tay, and through which ice from the Tay valley 
passed over into Loch Awe, thus lowering the col. The loch lies on 
morainic material, and is ponded by the deltas of the small side- 
streams which the outflow is unable to remove, the gradient being 
too gentle. 
BiRKA. — Small rock-basin on granite of Roeness Hill, Shetland. 
Black (Etive basin). — Chain of small rock-basins in the volcanic rocks of 
