Conodonts indicate that the Englewood Formation of the Black Hills is in part Upper Devonian and in part Lower Mississippian. The conodont fauna which occurs in the middle of the formation at Boxelder Canyon is correlated with a previously described Upper Devonian fauna from the Bighorn and Wind River mountains. The upper few feet of the Englewood and basal part of the Pahasapa Formation at Boxelder and Whitewood canyons contain diagnostic Lower Mississippian conodonts.

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