Late Cretaceous (Maastrichtian) foraminiferal assemblage from the inoceramid beds, Ocozocoautla Formation, central Chiapas, SE Mexico

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 inoce...

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Detalles Bibliográficos
Autor: Omaña, Lourdes
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:México
Institución:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
Repositorio:Revista Mexicana de Ciencias Geológicas
Idioma:inglés
OAI Identifier:oai:ojs.rmcg.geociencias.unam.mx:article/808
Acceso en línea:http://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/808
Access Level:acceso abierto
Descripción
Sumario: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.