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The Chamberlain Formation, one of the lower members of the early Mesoproterozoic Belt Supergroup, has previously yielded low-diversity assemblages of microfossils but the reported fossils were of limited utility for inferring paleoenvironmental conditions. Here, we describe substantially more diverse microfossil assemblages from drill core of the Chamberlain Formation obtained from the Black Butte mine locality near White Sulphur Springs, Montana. The Chamberlain Formation biota contains abundant Valeria, Leiosphaeridia, Synsphaeridium, and Lineaforma, with lesser amounts of Satka, Symplassosphaeridium, andConiunctiophycus. The assemblages partially overlap with, but are distinct from, microfossils recently reported from the Greyson...

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