Page:Transactions of the Geological Society, 1st series, vol. 4.djvu/338

 alluvial flat for about three miles from the entrance of Glen Turit downwards, and the terraces which are always found bordering this flat, gradually disappear as the bottom of the glen contracts. A few interruptions occur here and there, apparently connected with the rockiness and irregularity of the ground, and these are most remarkable on the right side; but shortly before the glen turns to the south, and until we arrive at Glen Fintec, all the three lines are strongly marked on both sides. On the slope of a brown hill in this place they are particularly worthy of remark, on account of their continuity, preservation, and the almost absolute equality of their dimensions, not only through the course of each individual line, but respectively to each other. This is easily accounted for by the evenness both of the curvature and inclination of the plane of the hill on which they are marked, as well as by the form of its summit, which diverts the water courses in such a direction as to preserve that surface from their action. It is important to remark this equality, as it proves that the causes which produced these lines, have been similar and equal, and that the irregularities now to be met with are the result, not of irregularities in the action of the power by which they were produced, but of inequalities in the capacity of the ground on which these causes have acted.

At this place an elevated glen opens into Glen Roy on the right. No water enters into it from this valley, but the junction is formed by a dry plain extending for some space, which, declining gradually in the opposite direction, carries its waters towards Glen Gloy, with which it also communicates. As the bottom of this glen is, at its entrance, at a higher level than the lowermost of the lines, this latter is here interrupted; but the two upper ones enter it on each hand, and are continued for some way along its sides. It is