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Multibeam bathymetry data collected in Hudson Bay in 2004, 2005, 2007 and 2010 during an ArcticNet cruises onboard the CCGS Amundsen show two sectors characterized by a high density of pockmarks and peculiar ring structures. The first sector is situated in northern Hudson Bay close to Mansel Island and is characterised by a ± 2 km long depression in which pockmarks with an average diameter of 100 m and an average depth of 10 m are present. The second sector is divided into two distinct parts; a northern domain characterized by a significant number of pockmarks and a southern one dominated by abundant circular ring-like features. The ring structures are < 200 m in diameter and 10 m deep and have a central peak. The occurrence of these features could be explained by salt doming that fractured bedrock. The occurrence of the ring structures and the pockmarks within the same area suggests that they might be process-related and that fluid escape may be an important characteristic for both types of morphological features. The very good state of preservation of both the pockmarks and the ring structures and the fact that they attenuate iceberg scours suggest that they have been formed recently (after deglaciation, i.e., after ~8500 years). INTRODUCTION The Hudson Platform extends over an area of 600,000 km, corresponding to ~6 % of Canada’s landmass. The platform represents one of the largest Paleozoic sedimentary basins in Canada of which 2/3 is covered by water (Hamblin, 2008). The Hudson Bay Platform is the least studied intracratonic basin in North America even if it bears geological and morphological similarities with other hydrocarbon-prone intracratonic basins such as the Michigan and Illinois basins. However, the preserved sedimentary succession in the Hudson Bay Platform is significantly thinner than those measured in the two other basins (Lavoie et al., 2010a). Sporadic exploration for oil and gas started in 1923, and included a few onshore shallow wells in the 1940’s. Beginning in 1966, a series of onshore wells (four majors wells in Manitoba and Ontario) and offshore wells (five wells to a varying depth) were drilled by the industry and several seismic data acquisition programs lead by the oil companies and the federal government were undertaken between 1960 and 1990 (Table 1) (Sanford and Norris, 1973; Procter et al., 1984; Sanford and Grant, 1990; Sanford et al., 1993; Hamblin, 2008). In 2008, as part of the new NRCan program “Geomapping for Energy and Minerals (GEM)” in the Canadian North, the Geological Survey of Canada launched a 5 year-long project, the “Hydrocarbon potential of the Hudson Bay and Foxe basins”, which aims to generate new ideas and models about the hydrocarbon potential of these two regions. The re-evaluation of existing geoscientific data through the lens of modern ideas and theories and the application of new scientific technologies and new data acquisition are currently underway (Nicolas and Lavoie, 2009, 2010; Armstrong and Lavoie, 2010;

Imaging pockmarks and ring-like features in Hudson Bay from multibeam bathymetry data