122

ANCIENT SEA-MARGINS.

barriers assigned to it by Macculloch, Lauder, andMilne, seems to me established. To go no higherthan the delta-marking at the height of the No. 3shelf, we see that this body of water, if of a lacustrinenature, must have required not merely a barrier atthe west end of Glen Spean, but an additional oneupwards of 200 feet high at the contrary extremity(the Pass of Muckull), which has never been pre-tended. It only remains that we contemplate thesea as the true cause of these markings, and if ofthose above the No. 4 shelf, it may be asked whynot of that marking also, and all below ?

116. It is of scarcely less importance to trace themarks of water-levels below the No. 4 shelf. Wehave seen terraces at 325 and 391 feet in the lowerpart of Glen Spean, besides many of inferior eleva-tion. The 325-feet terrace, which extends so faralong the right side of the valley, forming the site ofTiendrish House and the manse and kirk of Kilma-nivaig, is repeated on the opposite side, on the fron-tier of Uniclian; the modern farmsteading of Corry-lioileach being situated upon it. A little farther up,Inch House stands upon a similar terrace, 345 feet.To return to the right side of the valley, a terrace of283 feet appears between the road and the river,with a portion of the Inverroy hamlet seated on it.Passing into the opening of Glen Roy, we find theroad mounting at the very first over a terrace, whose