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Crag-and-tail features, Amundsen Gulf, Canadian Arctic Archipelago

B. MacLean, S. Blasco, R. Bennett, J. E. Hughes Clarke and E. Patton
Geological Society, London, Memoirs, 46, 53-54, 30 November 2016, https://doi.org/10.1144/M46.84
B. MacLean
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
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  • For correspondence: Brian.Maclean@canada.ca
S. Blasco
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
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R. Bennett
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
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J. E. Hughes Clarke
2Ocean Mapping Group, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
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E. Patton
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
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Palaeo-ice streams existed in many marine channels of the Canadian Arctic Archipelago (e.g. Clark & Stokes 2001; Stokes et al. 2006; MacLean et al. 2010, 2015). These include Amundsen Gulf at the southwestern end of the Northwest Passage, where multibeam imagery has revealed a variety of subglacial features (Stokes et al. 2006; MacLean et al. 2012, 2015) (Fig. 1a, b). Six or more stacked ice-contact deposits in NW Amundsen Gulf indicate successive advances of a grounded ice stream from a pinning point on the rocky shallow seabed south of Banks Island. Stokes et al. (2006) also considered this to be a pinning point for the ice stream. Further evidence of the dynamic nature of glacial events in Amundsen Gulf is provided by Batchelor et al. (2014), who recognized sediment sequences deposited by eight individual Amundsen Gulf ice streams or readvances of the same ice stream in the outer gulf and on the Beaufort Shelf.

Fig. 1.

Multibeam sonar imagery and profile of crag-and-tail features formed subglacially in the lee of bedrock outcrops in northwestern Amundsen Gulf, Canadian Arctic Archipelago. (a) Location of study area (red box; map from IBCAO v. 3.0). …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Crag-and-tail features, Amundsen Gulf, Canadian Arctic Archipelago

B. MacLean, S. Blasco, R. Bennett, J. E. Hughes Clarke and E. Patton
Geological Society, London, Memoirs, 46, 53-54, 30 November 2016, https://doi.org/10.1144/M46.84
B. MacLean
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
  • Find this author on Google Scholar
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  • For correspondence: Brian.Maclean@canada.ca
S. Blasco
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
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R. Bennett
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
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J. E. Hughes Clarke
2Ocean Mapping Group, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
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E. Patton
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
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Crag-and-tail features, Amundsen Gulf, Canadian Arctic Archipelago

B. MacLean, S. Blasco, R. Bennett, J. E. Hughes Clarke and E. Patton
Geological Society, London, Memoirs, 46, 53-54, 30 November 2016, https://doi.org/10.1144/M46.84
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