Lower Silurian (Rhuddanian) brachiopods from the Argentine

Juan Luis Benedetto, L. Robin Cocks


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.

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