Cambrian phosphatic brachiopods from the Precordillera of western Argentina

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Abstract
The first Cambrian phosphatic brachiopods (Subphylum Linguliformea, Class Lingulata) are described from the San Juan Precor-dillera of western Argentina, including Neotreta tumida Sobolev, Quadrisonia minor Rowell & Henderson, Prototreta cf. mimica Bell, Curticia sp., Opisthotreta sp. and the new species Dactylotreta sanjuan-ensis and Picnotreta robusta. The faunas are of Middle to Late Cambrian age and originate from Cambrian allochthonous material within the Ordovician Los Sombreros Formation, as well as from material from within the parautochthonous Upper Cambrian/Lower Ordovician Cerro Pelado and El Relincho formations. The described Argentinean faunas are most similar to contemporaneous assemblages from southeastern Siberia, but are also comparable with lingulate faunas from North America and Greenland.