Keywords: Aulacoseira spp.; Bacterosira bathyomphala; Belcher_Islands_SQ19-1B; Berkeleya scopulorum; Caloneis sp.; Chaetoceros spp. resting spores; Cocconeis costata; Coscinodiscus centralis; Coscinodiscus radiatus; Craspedopleura kryophila; DEPTH, sediment/rock; Depth, sediment/rock, bottom/maximum; Depth, sediment/rock, top/minimum; Diatom; Diatoms; Diatoms, valves, including chaetoceros spp., resting spores; Dinoflagellate cysts; Diploneis cf. smithii; Diploneis litoralis var. arctica; Diploneis litoralis var. clathrata; Entomoneis gigantea; Entomoneis kjellmanii; Fossulaphycus arcticus; Fragilaria spp.; Fragilariopsis cylindrus; Fragilariopsis oceanica; Fragilariopsis reginae-jahniae; Gyrosigma hudsonii; Haslea kjellmanii; Highly branched isoprenoid (HBI) biomarkers; Hudson Bay; Light microscope, Zeiss, Axio Imager.A2; Melosira arctica; Navicula directa; Navicula imperfecta; Navicula kuripanensis var. borealis; Navicula transitans; Navicula valida; Nitzschia borealis; Nitzschia frigida; Nitzschia gelida var. manitounukensis; Nitzschia hudsonii; Paralia sulcata; Pinnularia quadratarea; Pinnularia quadratarea var. bicuneata; Pinnularia semiinflata; Plagiotropis maxima; Pleurosigma rhomboides; Porosira glacialis; Pseudogomphonema septentrionale var. septentrionale; Rhizosolenia spp.; Sample ID; sediment trap; Sinerima marigela; Stauroneis radissonii; Stenoneis inconspicua var. baculus; Surirella spp.; Tabularia fasciculata; Tabularia spp.; Tabularia tabulata; Thalassiosira angulata; Thalassiosira antarctica var. borealis, spore; Thalassiosira antarctica var. borealis, vegetative cell; Thalassiosira bulbosa; Thalassiosira gravida; Thalassiosira hyperborea; Thalassiosira nordenskioldii; Valves, total