Radiolaria from the late Paleozoic of the Southern Urals, USSR and West Texas, USA

The radiolarian succession from stratotypic sections for the Gzhelian Stage of the Late Carboniferous and the Asselian, Sakmarian and Artinskian stages of the Permian of the Southern Urals are described, as are the successions from the stratotype area for the Leonardian and Guadalupian stages of West Texas. The radiolarian ranges in the subject interval of the Southern Urals are used to identify twelve successive associations, whereas four radiolarian associations, one previously treated as a zone by other authors, are discriminated from the West Texas Leonardian and Guadalupian stages. We propose a broad correlation of the Bone Springs Formation with the Sakmarian to Artinskian interval of the Urals based on present knowledge of radiolarian ranges. Newly described taxa include ten new genera, forty-four new species, and one new subspecies.