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Lower and middle Cambrian rhynchonelliform brachiopods from the Precordillera terrane of Argentina

Published online by Cambridge University Press:  20 May 2016

Juan L. Benedetto  and
Rodolfo D. Foglia
Juan L. Benedetto
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra CICTERRA-CONICET, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 299, X5000JJC Córdoba, Argentina,
Rodolfo D. Foglia
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra CICTERRA-CONICET, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 299, X5000JJC Córdoba, Argentina,
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Abstract

The first Cambrian rhynchonelliformean brachiopods are described from the Precordillera mountain belt of west-central Argentina, including the new species Wimanella mollensis and Nisusia ancauchensis. Other forms are Diraphora cf. D. borealis (Walcott), Diraphora sp., and an indeterminate bohemiellid. Brachiopods come from the lowermost part of the Precordilleran Cambrian succession (El Estero and Soldano Members of the La Laja Formation, Cerro Totora Formation) and from the Ancaucha olistolith within the Los Sombreros olistostrome. The associated trilobites constrain the fossiliferous levels to the Bonnia-Olenellus, Poliella denticulata and Ehmaniella biozones. A re-assessment of paleobiogeographic affinities of lower and early middle Cambrian rhynchonelliform brachiopods using cluster analysis supports the existence of a widespread warm-water Tropical Realm—to which the described Precordilleran faunas belong—and a more restricted ‘Mediterranean’ Realm developed on the temperate, mixed clastic-carbonate platforms.

Type
Research Article
Information
Journal of Paleontology , Volume 86 , Issue 2 , March 2012 , pp. 273 - 281
Copyright
Copyright © The Paleontological Society 

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