Fossil collections from Devonian rocks in the Roberts Mountains and northern Simpson Park Range have yielded previously unreported brachiopod species and genera. One new early Middle Devonian zone, (the Athyris circula zone) is recognized, mainly on the basis of previously described brachiopods. Later Middle Devonian brachiopods belong to faunas characterized by Rensselandia or by Warrenella occidentalis which are believed to be facies faunas of Stringocephalus zone age.

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