1900-1901. | A Geological Trip. 175 
represented in the Ochil Hills and in the Pentlands near 
here. When we look at the magnitude of these great 
earth movements, we can well understand that the rocks 
in the immediate vicinity of the thrust planes themselves 
must have been much altered in their structure by the grind- 
ing and crushing process to which they have been subjected. 
Such is indeed the case, but in the limits of these short notes 
I do not intend to enter into particulars of change of mineral 
character, but merely to show you a few of the specimens 
of various kinds that I obtained from under the three great 
thrust planes. 
Quite close to ibuitrieallag ch a considerable patch of 
igneous rock occurs which bears the name of Borrolanite 
(Plate XVI. 2). It has been much sheared by movements 
between the Ben More thrust and the Moine thrust. You 
will easily observe the pulled-out appearance of the white 
erystals of felspar. On the shores of Loch Cama, about 
three miles west of Aultnacallagach, we can see the 
quartzites much affected by the Glencoul thrust (Plate XV. 
5). This specimen is much slickensided, and the mass of 
it so broken up that a slight tap with the hammer would 
suffice to smash it in pieces. Turning now to the S.W., 
we pursue our way through the little village of Elphin for 
an additional three and a half miles till we arrive at the 
famous Knockan Cliff, where the Moine thrust is so well 
displayed. Here, immediately under the Moine schists, 
are the crushed and torn limestones turned almost into a 
kind of marble by the treatment they have undergone 
(Plate XVI. 1). You will observe in this specimen the 
peculiar brecciated appearance suggestive of crushing and 
grinding. Here is another specimen of limestone ‘(Plate 
XV. 4) from the same locality. It is weathered on the 
surface, and shows in rather a striking way two separate 
lines of movement to which it has been subjected. 
On the way back to Aultnacallagach we shall turn nearly 
a mile out of our way on the ie towards Inchnadamff to 
visit the Ledbeg marble. This is a case of contact meta- 
morphism. The limestones have, by the intense heat of the 
large intrusive mass of igneous rock which forms the bulk 
of the hill Cnoc-an-Sroine, been converted into marble of 
