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Jasper pebbles in the Dalradian at the Highland Border

Synopsis Southern Highland Group (Upper Dalradian) conglomerates at the Highland Border contain subangular jasper pebbles, probably derived from a Precambrian iron-formation. The angularity of these pebbles suggests iron-formation rocks were formerly present in the source area for the Southern Highland Group. This source area is now concealed beneath the Midland Valley or possibly the Grampian Highlands. Jasper pebbles in the Torridon Group were probably derived from another, though petrographically similar, iron-formation to the NW of Scotland. Rounded jaspers in the Dalradian, therefore, are not distinctive of one particular source area, as has been recently proposed.