The Portezuelo Formation is a geologic formation of Late Cretaceous (Late Turonian to Early Coniacian) age, outcropping in the Mendoza, RÃÂo Negro and Neuquén provinces of Argentina. It is the fourth-oldest formation in the Neuquén Group and the older of the two formations in the RÃÂo Neuquén Subgroup. Formerly, that subgroup was treated as a formation, and the Portezuelo Formation was known as the Portezuelo Member.
The type locality of the Portezuelo Formation is the mountain range known as Sierra del Portezuelo in Neuquén Province. This formation conformably overlies the Lisandro Formation of the RÃÂo Limay Subgroup. In the top layers it grades into the Plottier Formation, the younger formation within the RÃÂo Neuquén Subgroup.
Sandstones and siltstones, probably deposited under fluvial conditions, make up the Portezuelo Formation. There are also occasional cemented claystone deposits, as well as numerous paleosols (fossil soils). The formation varies between thick throughout its range.
Many dinosaur fossils have recently been described from this formation, as well as remains of several other types of animals: