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Late Cretaceous (Maastrichtian) foraminiferal assemblage from the inoceramid beds, Ocozocoautla Formation, central Chiapas, SE Mexico Translated title: Asociación de foraminíferos del Cretácico Tardío en los estratos de inocerámidos, Formación Ocozocoautla, Chiapas central, SE de México

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      Abstract

      Foraminifera from samples collected in the lower part of the Ocozocoautla Formation were studied. This sequence crops out north-west of Tuxtla Gutiérrez in central part of Chiapas state in south-eastern Mexico. The lower part of the unit consists mostly of argillaceous and marly sandstone with inoceramids. This horizon yields a poorly preserved but biostratigraphically useful foraminiferal assemblage. The upper part of the Gansserina gansseri zone is defined on the basis of the planktic foraminiferal association. An early Maastrichtian age has been assigned, rather than late Campanian-Maastrichtian as previously determined in the literature. The environment was interpreted as outer shelf-upper slope with Tethyan affinities, on the basis of the benthic and planktic foraminiferal association.

      Translated abstract

      Se realizó un estudio de foraminiferos en muestras colectadas de la parte inferior de la Formación Ocozocoautla. Esta secuencia aflora al noroeste de la ciudad de Tuxtla Gutiérrez, en la parte central del Estado de Chiapas en el sureste de México. La parte inferior de esta unidad está compuesta de arenisca arcillosa y arenisca margosa que contiene inocerámidos; este horizonte presenta una asociación de foraminiferos pobremente preservada pero bioestratigraficamente útil. La parte superior de la Zona de Gansserina gansseri fue definida con base en la asociación de foraminiferos planctónicos. La edad asignada es Maastrichtiano temprano más bien que Campaniano-Maastrichtiano como fue previamente expresado en la literatura. Se sugiere un ambiente de plataforma externa-talud superior, de aguas cálidas de la Provincia del Tethys, tomando en cuenta la asociación de foraminiferos bentónicos y planctónicos.

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      Most cited references 33

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      A water depth model for the evolution of the planktonic Foraminiferida

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        Paleobiogeography of Campanian-Maastrichtian foraminifera in the southern high latitudes

         Brian Huber (1992)
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          Late Triassic-Jurassic paleogeography and origin of Gulf of Mexico basin

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            Author and article information

            Contributors
            Role: ND
            Journal
            rmcg
            Revista mexicana de ciencias geológicas
            Rev. mex. cienc. geol
            Instituto de Geología, UNAM (México )
            2007-2902
            2006
            : 23
            : 2
            : 125-132
            S1026-87742006000200002

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Mexico
            Categories
            Geology
            Geosciences, Multidisciplinary

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