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Revista mexicana de ciencias geológicas
On-line version ISSN 2007-2902Print version ISSN 1026-8774
Rev. mex. cienc. geol vol.22 n.1 Ciudad de México Apr. 2005
Artículos
Barremian planktonic foraminiferal events correlated with the ammonite zones from the San Lucas Formation, Michoacán (SW Mexico)
Eventos de foraminíferos planctónicos del Barremiano correlacionados con las zonas de ammonites de la Formación San Lucas, Michoacán, suroeste de México.
1Instituto de Geología, Universidad Nacional Autonóma de México, Ciudad Universitaria, Delegación Coyoacán, 04510, México, D.F., Mexico. lomanya@geologia.unam.mx
We studied the Tiringueo section from the San Lucas Formation, located in the state of Michoacán, SW Mexico. The section is a flysch sequence consisting of a rhythmic deposit of shale, siltstone, and fine to medium graded sandstone interbedded with limestone. The sequence contains ammonites, foraminifera and radiolarians.
The biostratigraphic analysis, based on the planktonic foraminifera and ammonites, permitted the recognition of the biostratigraphic units established on both fossil groups, for first time in SW Mexico. Although the planktonic foraminifera are scarce and poorly preserved, some important events such as the first occurrence of Hedbergella similis, Globigerinelloides blowi and Globigerinelloides aptiensis were correlated with the ammonite zones. By means of these foraminiferal events, the Zones of Hedbergella similis and Globigerinelloides blowi partim (early and late Barremian) were identified. The faunal assemblage and distinctive lithological characteristics suggest that the San Lucas Barremian sequence was deposited in pelagic conditions.
Key words: planktonic foraminifera; Barremian; San Lucas Formation; Michoacán; Mexico
La sección Tiringueo de la Formación San Lucas, localizada en el Estado de Michoacán, es una secuencia de tipo flysch que consiste en un depósito rítmico de lutita, limolita, y arenisca gradada de media a fina, interestratificada con caliza. Esta secuencia contiene amonites, foraminíferos y radiolarios.
El análisis bioestratigráfico basado en el estudio de los foraminíferos planctónicos y amonites permitió reconocer las unidades bioestratigráficas de ambos grupos fósiles por primera vez en el Sureste de México. Aunque los foraminíferos planctónicos son escasos y pobremente conservados algunos importantes eventos como la primera aparición de Hedbergella similis, Globigerinelloides blowi y Globigerinelloides aptiensis fueron correlacionados con las zonas de amonites. Por medio de estos eventos las Zonas de Hedbergella similis y Globigerinelloides blowi partim (Barremiano temprano y tardío) fueron identificadas. La asociación faunística y las características litológicas sugieren que la Formación San Lucas (Barremiano) fue depositada en un ambiente pelágico.
Palabras clave: foraminíferos planctónicos; Barremiano; Formación San Lucas; Michoacán; México
ACKNOWLEDGMENTS
This paper is a contribution to the project DGAPA -PAPIT IN103799. We are deep grateful to the anonymous referees for the critical review and useful comments which greatly improved the manuscript. We acknowledge Ana Bertha Villaseñor and Pedro García Barrera for assisting in the field work . We thank Barbara Martiny for the English revision and Diego Aparicio for preparing the thin sections.
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Received: February 11, 2004; Revised: October 22, 2004; Accepted: November 11, 2004
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