Page:Transactions of the Geological Society, 1st series, vol. 4.djvu/342

 no place does the altitude of these hills rise to the level of this lowest line; a fact which it will be necessary to keep in mind when we enquire into the causes that have led to the formation of these lines. It is also necessary to remark that through this wide and irregular space there are no streams of any note, but that the whole is drained in an almost imperceptible manner into the only river which traverses it; the Spean. The opening of this valley is wider than its mean dimension, since it gradually and imperceptibly loses itself in the great valley of the Lochy, which forming a wide plain, at length terminates in the sea at Loch Eil.

Before examining the distant connections of Glen Roy it is necessary to return to its more immediate ones; as in them alone the traces of the lines are marked. Having already mentioned all that was required relating to Glen Fintec and Glen Spean, it only remains to describe Glen Turit, which I deferred lest it should interrupt the more important account of Glen Roy itself.

I mentioned that towards the upper part of Glen Roy two glens entered by wide openings, bringing in two tributary streams to the Roy. One of these, of inconsiderable extent, has already been sufficiently described. The other, Glen Turit, forms a communication between Glen Roy and Glen Gloy, rising between the two and discharging its waters on both sides. Where it falls into Glen Roy it is at so high a level as to exclude the lowermost of the lines. Traces however of the two upper ones enter its mouth, on the right hand side of which (looking from the source of the water) they speedily and suddenly disappear. But on the left, besides a short trace of the second, a line is to be seen extending for the space of a mile or more on a level with the uppermost in Glen Roy, until it is cut off by the rising of the bottom of the glen.