Abstract
The study of continental rocks in the Metztitlan area allows to defi ne a new lithostratigraphic unit. The Metztitlan Formation is formed by conglomeratic rocks which in the base have clastics of igneous extrusive rocks (basalt) and toward the top of the conglomeratic column change to clastics of carbonate rocks derived from cretaceous sedimentary rocks. The column of continental rocks rest over marine Albian-Cenomanian rocks with an unconformity contact. It is proposed to formalice the lithostratigraphy of continental rocks in the area as a type locality of the Metztitlan Formation is proposed the Santuario de las Cactaceas en Metztitlan. Toward the northeast of Metztitlan in Zacualtipan-Atotonilco El Grande areas there is a column of Pliocene volcanic rocks which are part of the eastern part of the Transmexican Volcanic Belt. The outcrops close to the deposit area of the Metztitlan Formation are of calcareous rocks of the Upper Tamaulipas Formation.
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