Eocene strata from the Sabinas Basin and their bearing in sedimentary basin correlation in NE Mexico

Resumen

The El Arco section,
located on the southeast margin of the Sabinas Basin (Adjuntas
Sub-basin), includes a succession consisting of Upper Cretaceous
formations typical for this unit, as well as Paleogene strata
similar to those previously reported from the La Popa Basin,
adjacent to the Sabinas Basin. The El Arco carbonate lentil includes
microfossils and nautiloids that indicate a middle Eocene age, which
is consistent with previous stratigraphic inferences for the La Popa
Basin. The presence of the nautiloid Hercoglossa sp. cf. H.
peruviana in the El Arco Lentil and in the upper portion of the
Rancho Nuevo Formation of Parras Basin, suggests a new correlation
scheme for the Tertiary stratigraphic units of the three basins
(Parras, La Popa and Sabinas basins). All three units had sediment
input as late as middle Eocene time.