Abstract
A brachiopod fauna spanning the Tournaisian-Visean boundary is reported from the Southern Tienshan Mountains of Xinjiang, NW China. This fauna exhibits strong generic and specific links with coeval North American faunas. The present fauna is of close affinity with those of the northern Tienshan and Junggar Basin rather than that of the Tarim Basin. Biogeographically, the southern and northern Tienshan areas belong to the Tienshan-Hinggan Province of the Boreal Realm during the Tournaisian and Visean, while the adjacent Tarim Basin belongs to the Tethyan Province of the Tethyan Realm, which differs from the conclusions of previous studies. Two now species are proposed: Spirifer (Spirifer) gancaohuensis and Kitakamithyris karatagensis.
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