Keywords: Amphiprora pseudoduplex; Amphora laevis; Amphora laevissima; Amphora spp.; Astartiella spp.; Aulacoseira ambigua; Aulacoseira islandica; Aulacoseira spp.; Belcher_Islands_SQ19-1D; Belcher_Islands_SQ19-2D; Belcher_Islands_SQ19-3D; Belcher_Islands_SQ19-4D; Belcher_Islands_SQ19-5D; Belcher_Islands_SQ19-6D; Belcher_Islands_SQ19-7D; Belcher_Islands_SQ19-8D; Belcher_Islands_SQ19-9D; Biremis ambigua; Biremis solitaria; Biremis spp.; Brachysira spp.; Caloneis sp.; Chaetoceros, resting spores; Chaetoceros, vegetative cells; Craspedopleura kryophila; Date/Time of event; Diatom; Dinoflagellate cysts; Diploneis litoralis var. arctica; Diploneis litoralis var. clathrata; Diploneis spp.; Diploneis subcincta; Entomoneis concilians; Entomoneis gigantea; Entomoneis kjellmanii; Entomoneis paludosa; Entomoneis pseudoduplex; Entomoneis spp.; Event label; Fallacia forcipata; Fragilariopsis cylindrus; Fragilariopsis oceanica; Fragilariopsis reginae-jahniae; Gomphonemopsis spp.; Gyrosigma diaphanum; Gyrosigma hudsonii; Gyrosigma spp.; Gyrosigma tenuissimum var. hyperborea; Hantzschia weyprechtii; Haslea crucigeroides; Haslea kjellmanii; Highly branched isoprenoid (HBI) biomarkers; Hudson Bay; Ice drilling corer (Kovacs); Kurpiszia kryokonites; Kurpiszia subprotracta; Latitude of event; Longitude of event; Navicula algida; Navicula directa; Navicula gelida; Navicula glaciei; Navicula hanseatica; Navicula imperfecta; Navicula impexa; Navicula kariana var. detersa; Navicula kariana var. frigida; Navicula lineola var. lineata; Navicula lineola var. perlepida; Navicula ludloviana var. unilateralis; Navicula novadecipiens; Navicula oestrupii; Navicula pagophila var. manitounukensis; Navicula pelagica; Navicula pellucidula; Navicula sibirica; Navicula spp.; Navicula subinflata; Navicula superba; Navicula transistans; Navicula transistans var. detersa; Navicula trigonocephala var. depressa; Navicula trigonocephala var. trigonocephala; Navicula valida; Navicula valida var. minuta; Navicula vanhoeffenii; Nitzschia angularis; Nitzschia borealis; Nitzschia capitellata; Nitzschia cf. distans; Nitzschia cf. kryophila; Nitzschia cf. littorea; Nitzschia distans var. erratica; Nitzschia frigida; Nitzschia gelida; Nitzschia gelida var. manitounukensis; Nitzschia hudsonii; Nitzschia hybrida; Nitzschia laevissima; Nitzschia lanceolata; Nitzschia neofrigida; Nitzschia polaris; Nitzschia sp.; Nitzschia spp.; Petroneis glacialis; Petroneis glacialis var. hudsonii; Pinnularia quadratarea var. bicontracta; Pinnularia quadratarea var. constricta; Pinnularia quadratarea var. cuneata; Pinnularia quadratarea var. dubia; Pinnularia quadratarea var. leptostauron; Pinnularia quadratarea var. maxima; Pinnularia quadratarea var. minor; Pinnularia quadratarea var. quadratarea; Pinnularia quadratarea var. subglabra; Pinnularia semiinflata; Pinnularia semiinflata var. decipiens; Pinnularia spp.; Plagiotropis maxima; Plagiotropis spp.; Pleurosigma clevei; Pleurosigma clevei var. manitounukensis; Pleurosigma rhomboides; Pleurosigma spp.; Pleurosigma stuxbergii; Pseudogomphonema groenlandicum; Pseudogomphonema septentrionale; Relative abundance (counted and calculated); Rhoicosphenia marina; Sample ID; sediment trap; Stauroneis radissonii; Stauroneis sp.; Stauronella arctica; Stauronella indubitabilis; Stenoneis inconspicua var. baculus; Stenoneis obtuserostrata; Stenoneis wojtek-kowalskii; Thalassiosira hyperborea var. hyperborea