Figure F13. Abundance estimates for all major fossil groups. Sea ice diatoms include Thalassiosira antarctica spores, Bacteriosira fragilis, Porosira glacialis, and Fragilariopsis cylindrus. Sea ice dinoflagellate cysts include Islandinium minutum, Operculodinium centrocarpum (Arctic morphotype), and Impagidinium minutum. For calcareous nannofossil and benthic foraminifer abundances, B = barren, P = present, R = rare, F = few, C = common, A = abundant, and D = dominant. For benthic foraminifer abundance estimates, see "Biostratigraphy" in the "Methods" chapter.
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