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River-gorges are characteristic features in many of the valleys. In the Old Red Sandstone they are particutarly prominent where that formation has lain in the pathway of the streams sweeping down from the Highlands. In the basin of the Moray Firth some fine examples may be seen on the Nairn and Findhorn, while on the west side of the Cromarty Firth some of the small streams descending from the high grounds of the east of the shire of Ross and Cromarty have cut out defiles in the Congiomerates, remarkable for their depth and narrowness. Towards the south margin of the Highlands notable instances of true canyons in the Old Red Sandstone are to be seen where the Isla and North Esk enter that formation. The well-known gorge in which the Falls of Clyde are situated is the best example in the Lowlands. |
