Abstract

The fossil pollen genus Morinoipollenites has been frequently reported in strata from the Upper Cretaceous of northern China and southeastern Russia. Pollen grains belonging to a single fossil species, Morinoipollenites normalis, have been only rarely encountered in Upper Cretaceous strata of North America. Just five specimens of Morinoipollenites have been recovered from sites of definite or probable Maastrichtian age in Alaska, Alberta, Saskatchewan, and Colorado. It is argued that the rarity in North America, common Asian occurrences, large size of pollen grains, and complex morphology of the pollen favour these pollen grains having been transported to North America from Asia by some vector. The transporting vector would most likely have been a flying organism based on the life styles of the producing plants and transporting organisms, long distance of transport, and morphology of the pollen grains.

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