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Journal of the Geological Society; 1999; v. 156; issue.1; p. 55-61;
DOI: 10.1144/gsjgs.156.1.0055
© 1999 Geological Society of London

Article

Late Vendian-?Cambrian glacially influenced deep-water sedimentation, Macduff Slate Formation (Dalradian), NE Scotland

M. S. STOKER1, J. A. HOWE2, & S. J. STOKER3

1 British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK (e-mail: m.stoker{at}bgs.ac.uk)
2 British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 OET, UK
3 British Geological Survey, DTI Core Store, 376 Gilmerton Road, Edinburgh EH17 7QS, UK

The deep-water metasedimentary rocks of the late Dalradian Macduff Slate Formation preserve a record of distal glaciomarine sedimentation in the form of ice-rafted dropstones and related bedding-deformation structures, glaciogenic debris-flow diamictites and an allochthonous slump unit. The input of ice-rafted debris was cyclical and probably related to periodic disintegration of the marine margin of an ice sheet. Downslope resedimentation processes, typical of glaciated continental margins, were responsible for the diamictites and slump deposits which were probably derived from the adjacent outer shelf and upper slope, in common with Pleistocene analogues off NW Britain. The uppermost diamictite bed is an integral part of the deep-marine succession, in contrast to the previously proposed lodgement-till hypothesis.

Key Words: Macduff Slate Fm • upper Dalradian • Scotland • glaciomarine sedimentation • deep-sea sedimentation




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