LAKES IN RELATION TO GEOLOGICAL FEATURES 505 
Eilean Siibhainn, is U-shaped, the deepest portion occurring where 
the valley is most constricted, between Ben Slioch (3217 feet) on 
the north and Meall a' Ghubhais (2882 feet) on the south. Between 
Regoilachy and Coppachy the effect of a branch fault in weakening 
the strata is shown by the widening of the basin and the loop of the 
250-ft. contour line in that portion of the lake. 
The Ardlair basin, beyond the islands, is a composite one. The 
north-west portion, north of Rudh' Aird an Anail, is situated in the 
line of the great shatter-belt, and is U-shaped ; but the wider and 
deeper part of the same basin, lyii^g between that promontory and 
Eilean Ruairidh Mor, is evidently due to the removal of comparatively 
weak strata, consisting of the lowest division of the Torridon Sand- 
stone, from the old floor of Lewisian Gneiss on which it was deposited. 
The Slattadale basin rests in Torridonian strata, belonging partly 
to the Applecross grits and partly to the weaker beds of the 
Diabaig group. A striking feature of this part of the lake is the 
number and size of the islands, which are composed mostly of massive 
Torridon sandstones and grits. One of these, Eilean Subhainn, 
contains a rock-basin 64 feet in depth. 
The river Ewe, which drains the loch, has cut a channel through 
the deposits of the 50-ft. raised beach, and runs for about half a 
mile over Torridonian strata before entering the sea. 
Loch Maree evidently extended farther up the valley, but it has 
been silted up by the streams that converge near Kinlochewe. This 
part of the lake was probably comparatively shallow, as Eilean na 
Craoibhe, near the head of the existing loch, is a moraine more or 
less levelled by the action of the waves. 
Martnaham. — Kettle-hole in fluvio-glacial deposits. 
Meide, na. — Rock-basin in Moine schists. It drains into Loch Naver, 
and is situated on the pass leading to the Kyle of Tongue, along one 
of the outlets of the Mid-Sutherland ice-cauldron between Ben 
Loyal and Ben Hope. 
Meiklie. — Remnant of partly silted up rock-basin in crystalline schists 
in Glen Urquhart. 
Menteith. — V^ol. IL Part L p. 52. 
Merkland. — Rock-basin in Moine schists, partly ponded by drift and 
partly silted up. 
Mhic Tlle Riabhaich. — Ponded by moraines. 
Mhiotailt.— Vol. II. Part I. p. 189- 
Mhor (Ness basin). — Artificial reservoir for Foyers Aluminium Works. 
It covers the site of Lochs Garth and Farraline, small rock-basins on 
the plateau above Loch Ness (see Loch Bran). 
Mhuilinn, a'. — Vol. II. Part I. p. 353. 
MiGDALE. — Partly in crystalline schists and partly drift-dammed. 
Mill. — Kettle-hole in fluvio-glacial gravels. One of the Lochmaben lochs. 
Milton. — Ponded by drift resting on Silurian greywackes and shales. 
