176 A Geological Trip. [Sess. 
singular purity and whiteness—the well-known Ledbeg 
marble (Plate XVI. 3). 
To the east of Aultnacallagach, say about three miles, is a 
little loch called Loch Ailsh. It lies in a valley just under 
the Moine thrust plane, and in its vicinity the action of the 
great thrust on the limestones can be well studied. There 
you see them sticking up out of the ground like flagstones, 
sheared and drawn out till they are quite fissile, like shales, 
and subjected to such intense pressure that in many parts 
they are converted into fine white marble (Flaser marble) 
(Plate XVI. 4). You can see in this specimen how the 
marble tends to split along certain planes. Plate XV. 6 
is another specimen of sheared limestone from the same 
place. Another rock there is in this place, evidently a 
limestone at one time, into which had been intruded a 
dyke of ultra-basic igneous rock. This rock had been much 
serpentinised, and when the thrust took place, limestone and 
dyke became inextricably mixed, the limestone being changed 
into white marble, the serpentine retaining its green colour, 
and the whole having somewhat the appearance of a pot 
of white paint into which a little green pigment had been 
stirred, but yet not enough to mix it properly (Plate XVI 
5, 6). 
I have just one more specimen to show you: it is a piece 
of the crumpled schist from the Moine thrust at the same 
spot (Plate XVII. 2). This concludes these few notes on a 
district of great interest, and I trust, though they have 
been of necessity rather rambling and diffuse, they have 
been sufficient to show that any one with a geological 
turn can spend as much time as he has to spare, with 
profit, in the places spoken of. He will also bring home 
more luggage than he started with. His boots will probably 
be down at heel and pretty well used up, but his brains 
will be brightened and his experience considerably enlarged. 
On account of the death of her Majesty Queen Victoria 
on the 22nd January 1901, the meeting of the Society called 
for the 23rd January was postponed until the 6th February, 
