Abstract

PINEDA-SALGADO, Gabriela et al. Contribution to the stratigraphic range of the Agueguexquite Formation (Miocene), Veracruz, Mexico. Bol. Soc. Geol. Mex [online]. 2016, vol.68, n.2, pp.187-197. ISSN 1405-3322.

The Agueguexquite Formation crops out in southeastern Mexico, in southern Veracruz and northern Chiapas; its age has not been formally determined, but previous studies consider that it was deposited between the Miocene and Pliocene. Mollusks and rock samples from three localities of the Agueguexquite Formation in Veracruz were collected in order to define the stratigraphic range of this formation by means of relative ages using benthic forams and calcareous nannoplankton, as well as isotopic stratigraphy ( 87 Sr/ 86 Sr). Dating with benthic forams indicates a broad stratigraphic range (Miocene-Pliocene); calcareous nannoplankton yielded a middle-late Miocene age, which is supported by the results of isotopic stratigraphy ( 87 Sr/ 86 Sr). Based on our stratigraphic results, it is suggested that the Agueguexquite Formation was deposited between the middle and late Miocene.

Keywords : Agueguexquite Formation; Miocene; stratigraphy; Veracruz; Mexico.