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The Kinlochlaggan Boulder Bed occurs in Neoproterozoic Dalradian rocks of the Grampian Mountains of Scotland. It is currently thought to represent a glacial event ( c. 800 Ma) unique in the North Atlantic region, and be part of a sequence correlated by different workers with either the Grampian or Appin groups. We correlate the Boulder Bed with the Port Askaig Tillite of Vendian ( c. 650 Ma) age, and deduce that the sequence in which it occurs belongs to the younger Argyll Group. The latter is preserved within the D2 Kinlochlaggan Synform, and a previously unrecognized discontinuity of regional importance may separate inverted Argyll Group rocks from the underlying Grampian Group.

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