Collections from a single outcrop of a 5-ft thick limestone unit on Turkey Creek, Marshall County, Okla., include a diverse trilobite fauna consisting of a phacopid, a dalmanitid, a scutelluid, an odontopleurid, and several proetids. One species, Reedops amsdeni, and two subspecies, Ceratonurus selcanus dilatus and Cornuproetus pictus contractus, are new. The trilobites indicate a lower Emsian age for the unit, which cannot be correlated with previously known Lower Devonian units in Oklahoma. Both lithologically and faunally the Turkey Creek limestone unit belongs to the Hercynian magnafacies and represents an incursion of Old World Province trilobites into an area which, before and after, belonged to the Appalachian Province.

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