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Selected Middle Ordovician key conodont species from the Santa Gertrudis Formation (Salta, Argentina): an approach to its biostratigraphical significance

Published online by Cambridge University Press:  15 December 2016

JOSEFINA CARLOROSI ,
GRACIELA SARMIENTO  and
SUSANA HEREDIA
JOSEFINA CARLOROSI*
Affiliation:
CONICET- INSUGEO (UNT). Miguel Lillo 205, Tucumán (4000), Argentina
GRACIELA SARMIENTO
Affiliation:
Departamento de Paleontología, Universidad Complutense de Madrid, José Antonio Novais, Madrid (28040), Spain
SUSANA HEREDIA
Affiliation:
CONICET- Instituto de Investigaciones Mineras (UNSJ). Libertador 1109, San Juan (5400), Argentina
*
†Author for correspondence: [email protected]
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Abstract

We have analysed a newly exposed conodont association from the Santa Gertrudis Formation in the Mojotoro Range, Eastern Cordillera of Salta province, Argentina. The key species Baltoniodus triangularis (Lindström), Trapezognathus quadrangulum (Lindström) and Erraticodon patu Cooper are present. A new species of the genus Baltoniodus (Baltoniodus cooperi sp. nov.) and elements of Periodon aff. P. flabellum are included in this conodont study. The key conodont B. triangularis indicates an age of lower Dapingian (Middle Ordovician) for the bearing strata. This was also recognized in other localities of the Eastern Cordillera, allowing their correlation. The conodonts from the Santa Gertrudis Formation provide conclusive elements on palaeogeographic interpretation by sharing species with Baltoscandia, South China and Australia, suggesting strong faunal affinities with these provinces.

Keywords

ConodontsDapingianSanta Gertrudis FormationArgentina
Type
Original Articles
Information
Geological Magazine , Volume 155 , Issue 4 , May 2018 , pp. 878 - 892
Copyright
Copyright © Cambridge University Press 2016 

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