Vol. 29 No.1 March 2006

Journal of International Geoscience

Published by the International Union of Geological Sciences

by Walter C. Sweet¹ and Guillermo L. Albanesi²

Graphic correlation of Argentine Precordillera and North American Lower/Middle Ordovician sections

1 Department of Geological Sciences, The Ohio State University, Columbus, Ohio 43210, USA. E-mail: wsweet@columbus.rr.com
2 CONICET – Museo de Paleontología, Universidad Nacional de Córdoba, C. C. 1598, 5000 Córdoba, Argentina.E-mail: galbanes@com.uncor.edu

Abstract 

Present work demonstrates that a level equivalent to the proposed Whiterockian basal GSSP can be located graphically in a composite section anchored by the Niquivil section of the Argentine Precordillera. The FAD of Cooperignathus aranda in the Niquivil composite section, a candidate for GSSP of the Lower/Middle Ordovician boundary, projects to a level very close to the FAD of Tripodus laevis in the Whiterockian reference section. The conodont-based framework reported here includes the potential for recognition of the proposed Whiterock Canyon-based GSSP, the Cooperignathus aranda-based GSSP, and, possibly, the Baltoniodus triangularis-based GSSP, recently proposed.

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