Early Silurian (Rhuddanian) brachiopods from the Argentine Precordillera and their biogeographic affinities
Early Silurian (Rhuddanian) brachiopods from the Argentine Precordillera and their biogeographic affinities
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作者：
J. Benedetto;L. Cocks
一种腕足动物区系，以印度菜属（J. de C. Sowerby）为主，还包括一种不确定的伪舌虫、Leangella (Leangella) america 11 . sp、eplectodonta (eplectodonta) duplicata （J. de C. Sowerby）、Fardenia sp.、Glyptorthis vidari （Baarli）。在阿根廷圣胡安省Mogotes Azules的La Chilca组中发现了一种不确定的giraldiellid， Dalmanella sp.和Stegerhynchus pusillum （J. de C. Sowerby）。动物群的年龄为早志留纪（llanddovery: rhdanian），并与来自Gondwana和其他地方的其他rhdanian腕足动物群进行了比较。冈瓦纳的腕足动物，尽管多样性相对较低，但与劳伦西亚和阿瓦洛尼亚-波罗的海的腕足动物有很多共同之处，预示着志留纪上半叶盛行的世界主义
A brachiopod fauna dominated by Hindella crassa (J. de C. Sowerby), and also including an indeterminate pseudolinguloid, Leangella (Leangella) america nov. sp., Eoplectodonta (Eoplectodonta) duplicata (J. de C. Sowerby), Fardenia sp., Glyptorthis vidari (Baarli)., Dolerorthis plicata (J. de C. Sowerby), an indeterminate giraldiellid, Dalmanella sp., and Stegerhynchus pusillum (J. de C. Sowerby), is described from the La Chilca Formation exposed at Mogotes Azules, San Juan Province, Argentina. The age of the fauna is Early Silurian (Llandovery: Rhuddanian) and it is compared with other Rhuddanian brachiopod faunas both from Gondwana and elsewhere. The brachiopod faunas of Gondwana, despite their relatively low diversity, had much in common with those from Laurentia and Avalonia-Baltica, and heralded the cosmopolitanism that prevailed for all of the first half of the Silurian