Palaeogene fungal spores and fruiting bodies of the Canadian arctic

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Abstract
In the Palaeogene deltaic sediments of the Mackenzie Delta region, fungal spores seem to be more resistant than other palynomorphs, occasionally constituting more than 50% of the assemblage. They have proved to be important and practical fossils for stratigraphic correlation. The Pesavis zone is named after the conidiospore Pesavis tagluensis. Evolutionary changes in fungi connected with the development of the angiosperms and local extinctions caused by alterations of the climate are reflected in the record. Relative abundances of major groups already identify gross stratigraphic intervals. Species are being identified and catalogued, so that their ranges can be determined. The variable morphology is illustrated on a plate; no new species are described.