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Updated: May 17, 2025
Some of these phenomena may now, as we have seen, be accounted for by assuming that there was once a crust of ice resembling that now covering Greenland. The Grampians in Forfarshire and in Perthshire are from 3000 to 4000 feet high. To the southward lies the broad and deep valley of Strathmore, and to the south of this again rise the Sidlaw Hills to the height of 1500 feet and upwards.
It seemed only a year or so since he was a gay-hearted lad upon the Sidlaw hills, and yesterday since he made his first adventure in arms, with the army of France. Again he is sitting by the camp-fire in the Low Country, and crossing swords for the first time with Hugh MacKay, with whom he is to settle his warfare to-morrow.
Some of these rocks look as if they had flowed as lavas over the bottom of the sea, and enveloped quartz pebbles which were lying there, so as to form conglomerates with a base of greenstone, as is seen in Lumley Den, in the Sidlaw Hills.
All the deposits which he had before examined begin then to recur in reversed order, until he arrives at the central axis of the Sidlaw hills, where the strata are seen to form an arch, or SADDLE, having an ANTICLINAL line, B, in the centre.
This band of till, with Grampian boulders and associated river-gravel, may be traced continuously for a distance of 34 miles, with a width of 3 1/2 miles, from near Dunkeld, by Coupar, to the south of Blairgowrie, then through the lowest part of Strathmore, and afterwards in a straight line through the greatest depression in the Sidlaw Hills, from Forfar to Lunan Bay.
Away in bonnie Glen Ogilvie, where everything is at its best to-day. I dreamed that I was off to Sidlaw Hill, to see what was doing with the muir-fowl, and I felt the good Scots air blowing upon my face. This is a black wakening, Jock, but I've slept worse, and you have done well for breakfast. Ye never came honestly by it, man. Have ye been raiding?"
These phenomena, which occur at the foot of the Grampians, are repeated in the Sidlaw Hills; and it appears that in this part of Scotland volcanic eruptions were most frequent in the earlier part of the Old Red Sandstone period.
It may be argued that the transportation of such blocks may have been due not to floating ice, but to a period when Strathmore was filled up with land ice, a current of which extended from the Perthshire Highlands to the summit of the Sidlaw Hills, and the total absence of marine or freshwater shells from all deposits, stratified or unstratified, which have any connection with these erratics in Forfarshire and Perthshire may be thought to favour such a theory.
Come all to church to-morrow, and I'll let you hear how I'll gull the saints of Auchtermuchty. In the meantime, there is a feast on the Sidlaw hills tonight, below the hill of Macbeth Mount, Diabolus, and fly." Then, with loud croaking and crowing, the bridal of corbies again scaled the dusky air, and left Robin Ruthven in the middle of his cairn.
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