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The Sorachi Group of central Hokkaido is characterized by hemipelagic sediments and ophiolitic rock associations. To determine the precise age of the upper Sorachi Group, a key unit in the geotectonic... evolution of Hokkaido, radiolarian fossil assemblages have been studied. The results indicate that the upper Sorachi Group may be Albian in age, much younger than previously believed. This age is similar to that obtained for the youngest pelagites of the Nikoro Group of the Tokoro Belt, eastern Hokkaido, although the paleoenvironmental and paleogeographic settings of the two groups may well have differed.show more
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27_01_p001