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Journal of the Geological Society; 1996; v. 153; issue.1; p. 139-149;
DOI: 10.1144/gsjgs.153.1.0139
© 1996 Geological Society of London

Article

Indications of glaciation at the base of the Proterozoic Stoer Group (Torridonian), NW Scotland

STEPHEN DAVISON1 & MICHAEL J. HAMBREY2

1 Post-graduate Research Institute of Sedimentology, University of Reading, Whiteknights, Reading RG6 2AB, UK
2 School of Biological and Earth Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK

The Stoer Group of NW Scotland has long been regarded as the product of ephemeral flood events. The resulting facies have been interpreted as fanglomerates, braided river deposits and lake sediments. New observations of the Lewisian basement palaeotopography and basal Stoer Group facies at Enard Bay, Clachtoll and Achiltibuie suggest that earliest Torridonian time was characterized by glaciation. Lewisian basement displays rochr rnoutonnée-like forms and evidence of subglacial fracturing, possibly by water under high pressure. Breccias associated with rough, craggy basement are interpreted as fractured bedrock formed subglacially on the downglacier sides of the roches moutonnées. Diamictites draping the basement are regarded as basal tillite. Stratified diamictites and laminated mudstone-sandstone-breccia-conglomerate units contain outsized clasts, displaying drop-stone structures, and are therefore inferred to be ice-rafted deposits. Associated microbial carbonates are inferred to be analogous to contemporary Antarctic lake deposits. Limited palaeo-iceflow indicators suggest a source of the ice mass to the N or NE.


Keywords: Scotland, Proterozoic, Torridonian, glaciation.




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