Conodonts and Conodont Biostratigrapy of the Joins and Oil Creek Formations, Arbuckle Mountains, South-central Oklahoma

More than 63,000 conodont specimens were recovered from 112 samples collected from the Joins and Oil Creek Formations of south-central Oklahoma (Figure 1). The bulk of those specimens are assignable to 35 species including new species Histiodella labiosa, Neomultioistodus angulensis, N. erectus, and Paraprioniodus neocostatus. In addition, a new genus, Apteracontiodus, is established. The Joins–Oil Creek conodont fauna is dominated by species of Apteracontiodus, Drepanoistodus, Histiodella, Neomultioistodus, and Paraprioniodus. Conodont data indicate that the age of the Joins and Oil Creek ranges from late Dapingian to early Darriwilian age (early to middle Whiterockian)