Miospore assemblages from a drill hole in the western Moose River Basin comprise 26 species, coniferalean pollen being numerically dominant. Some species are common to putative Middle Jurassic horizons in the western Canadian plains, and comparisons can also be made with the British and French Middle Jurassic. A large hiatus exists between the terrestrial Middle Jurassic sediments and overlying terrestrial Albian (Lower Cretaceous) strata comprising the Mattagami Formation, and may parallel a similar hiatus in southeast Saskatchewan.

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