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Journal of the Geological Society; 1996; v. 153; issue.6; p. 823-826;
DOI: 10.1144/gsjgs.153.6.0823
© 1996 Geological Society of London

Article

A late Vendian age for the Kinlochlaggan Boulder Bed (Dalradian)?

RICHARD H. S. EVANS1 & P. W. Geoff TANNER

Department of Geology and Applied Geology, University of Glasgow, Glasgow G12 8QQ, UK

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.


Keywords: Dalradian, Proterozoic, Scotland, tillite.




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