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The Corossol Structure: a glaciated crater of possible impact origin in the northwestern Gulf of St Lawrence, eastern Canada

P. Lajeunesse, M. J. Duchesne, G. St-Onge, J. Locat, M. Higgins, R. Sanfaçon and J. Ortiz
Geological Society, London, Memoirs, 46, 127-128, 30 November 2016, https://doi.org/10.1144/M46.24
P. Lajeunesse
1Département de Géographie et Centre d’Études Nordiques, Université Laval, Québec, Quebec G1V 0A6, Canada
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  • For correspondence: patrick.lajeunesse@ggr.ulaval.ca
M. J. Duchesne
2Geological Survey of Canada, Natural Resources Canada, Québec, Quebec G1K 9A9, Canada
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G. St-Onge
3Institut des Sciences de la Mer de Rimouski and GEOTOP, Université du Québec à Rimouski, Rimouski, Quebec G5L 3A1, Canada
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J. Locat
4Département de Géologie et de Génie Géologique, Université Laval, Québec, Quebec G1K 7P4, Canada
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M. Higgins
5Sciences de la Terre, Université du Québec à Chicoutimi, Saguenay, Quebec G7H 2B1, Canada
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R. Sanfaçon
6Canadian Hydrographic Service, Institut Maurice-Lamontagne, Mont-Joli, Quebec G5H 3Z4, Canada
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J. Ortiz
7Department of Geology, Kent State University, Kent, Ohio 44242, USA
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The majority of confirmed impact craters on Earth have been discovered on land. However, the increased use of high-resolution, full-bottom-coverage seafloor mapping methods such as multibeam bathymetry have enabled the discovery of previously unknown subaqueous impact craters on continental margins and in large lakes. High-resolution bathymetric and sub-bottom profiler data collected south of the city of Sept-Îles in the northwestern Gulf of St Lawrence, eastern Canada (Fig. 1a), revealed a previously unreported circular structure of possible impact origin located 20 km off the mainland in water depths of 40–208 m (Fig. 1b, c) that had been overrun by the Laurentide Ice Sheet (Lajeunesse et al. 2013).

Fig. 1.

The Corossol Structure, northwestern Gulf of St Lawrence, eastern Canada. (a) Location of study area (red box; map from GEBCO_08). (b) The Corossol Structure from an oblique view. (c) The structure is delimited to the north by series of cuesta ridges. Streamlined glacial lineations and till on its surface indicate …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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The Corossol Structure: a glaciated crater of possible impact origin in the northwestern Gulf of St Lawrence, eastern Canada

P. Lajeunesse, M. J. Duchesne, G. St-Onge, J. Locat, M. Higgins, R. Sanfaçon and J. Ortiz
Geological Society, London, Memoirs, 46, 127-128, 30 November 2016, https://doi.org/10.1144/M46.24
P. Lajeunesse
1Département de Géographie et Centre d’Études Nordiques, Université Laval, Québec, Quebec G1V 0A6, Canada
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: patrick.lajeunesse@ggr.ulaval.ca
M. J. Duchesne
2Geological Survey of Canada, Natural Resources Canada, Québec, Quebec G1K 9A9, Canada
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
G. St-Onge
3Institut des Sciences de la Mer de Rimouski and GEOTOP, Université du Québec à Rimouski, Rimouski, Quebec G5L 3A1, Canada
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J. Locat
4Département de Géologie et de Génie Géologique, Université Laval, Québec, Quebec G1K 7P4, Canada
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  • Search for this author on this site
M. Higgins
5Sciences de la Terre, Université du Québec à Chicoutimi, Saguenay, Quebec G7H 2B1, Canada
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  • Find this author on PubMed
  • Search for this author on this site
R. Sanfaçon
6Canadian Hydrographic Service, Institut Maurice-Lamontagne, Mont-Joli, Quebec G5H 3Z4, Canada
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  • Find this author on PubMed
  • Search for this author on this site
J. Ortiz
7Department of Geology, Kent State University, Kent, Ohio 44242, USA
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The Corossol Structure: a glaciated crater of possible impact origin in the northwestern Gulf of St Lawrence, eastern Canada

P. Lajeunesse, M. J. Duchesne, G. St-Onge, J. Locat, M. Higgins, R. Sanfaçon and J. Ortiz
Geological Society, London, Memoirs, 46, 127-128, 30 November 2016, https://doi.org/10.1144/M46.24
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