Five species of brachiopods, two gastropods, one coral and one trilobite are described from the lower Jefferson Formation. New species are Atrypa oneidensis and Ambothyris utahensis. Spirifer engelmanni Meek is placed in the genus Allanaria. A correlation of the lower Jefferson with the strata containing the Allanaria allani fauna of Alberta and with the subzone in the lower 'Spirifer' argentarius zone of Nevada is suggested.

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