Palabras clave:

Pediastrum Meyen s.l., Formaci´ón Vaca Muerta, Titoniano, Cuenca Neuquina, Argentina


En esta contribución se da a conocer el hallazgo de especies de Pediastrum Meyen s.l. con cenobios perforados provenientes de los niveles basales de la Formación Vaca Muerta, extendiendo su primer registro estratigráfico a edades tan antiguas como el Titoniano. Los requerimientos ecológicos de Pediastrum simplex var. clathratum y P. simplex var. biwaense, sugieren el desarrollo de cuerpos de agua dulce bajo condiciones cálidas, lo cual refuerza las interpretaciones paleoclimáticas previamente propuestas para el Jurásico Tardío de la Cuenca Neuquina. La buena preservación de este material es interpretada como resultado de la co-ocurrencia de diferentes mecanismos que interactuaron durante el transporte, la acumulación y la diagénesis temprana de estos sedimentos y las especies de Pediastrum Meyen s.l. reconocidas.


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