A Late Ordovician brachiopod fauna from the Black River quadrangle (D-1 1:63,360 scale) of east-central Alaska comprises taxa typical of the Late Ordovician brachiopod fauna in the pericratonic epeiric seas of Laurentia, including Hesperorthis pyramidalis (Twenhofel, 1928), Plaesiomys occidentalis (Okulitch, 1943), Eoplectodonta sp., Holtehdalina sp., Leptaena sp., Brevilamnulella minuta n. sp., Tcherskidium tenuicostatum n. sp., Rhynchotrema iowense Wang, 1949, and Whitfieldella sp. The presence of Plaesiomys occidentalis and Tcherskidium tenuicostata n. sp. indicates a latest Katian age by correlation with similar species in the Mackenzie Mountains, southern Manitoba, Anticosti Island, the American midcontinent, Kolyma, and Siberia. Cluster analysis based on 20 well-studied late Katian brachiopod faunas from various regions within Laurentia and elsewhere in other tectonic plates suggests that the small brachiopod faunule from Alaska has the strongest paleobiogeographic affinity with Laurentia, confirming that the Black River quadrangle of Alaska was part of Laurentia during the Late Ordovician.UUID: http://zoobank.org/6b387856-61d5-4685-a592-faf5287c1e0f

中文翻译：

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来自阿拉斯加中东部、劳伦蒂亚西北边缘的晚奥陶世腕足动物

来自阿拉斯加中东部布莱克河四边形（D-1 1:63,360 比例）的晚奥陶世腕足动物群包括劳伦蒂亚近克拉通远洋中晚奥陶世腕足动物群的典型分类群，包括黄蜂（Twenhofel，1928 年），西洋杉（奥库利奇，1943 年），齿齿目sp.,荷特达利娜sp.,细线虫sp.,小短链球菌n. sp.,Tcherskidium tenuicostatumn. sp.,细纹毛虫王, 1949, 和惠特菲尔德拉sp。的存在西洋杉和Tcherskidium tenuicostan. sp。通过与麦肯齐山脉、曼尼托巴省南部、安蒂科斯蒂岛、美国中部大陆、科雷马和西伯利亚的类似物种的相关性，表明了最新的卡蒂亚时代。基于来自 Laurentia 和其他构造板块其他地方的 20 个经过充分研究的晚期 Katian 腕足动物群的聚类分析表明，来自阿拉斯加的小型腕足动物群与 Laurentia 具有最强的古生物地理亲和力，证实阿拉斯加的黑河四边形是奥陶纪晚期的劳伦蒂亚.UUID：http://zoobank.org/6b387856-61d5-4685-a592-faf5287c1e0f