Portezuelo Formation

Portezuelo Formation
Stratigraphic range: late Turonian–early Coniacian ~90.5–88.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Neuquén Group  Río Neuquén Subgroup
Underlies	Los Bastos Formation
Overlies	Lisandro Formation
Thickness	95–130 m (312–427 ft)
Lithology
Primary	Sandstone
Other	Conglomerate, limestone
Location
Coordinates	38°30′S 68°42′W / 38.5°S 68.7°W / -38.5; -68.7
Approximate paleocoordinates	44°24′S 47°12′W / 44.4°S 47.2°W / -44.4; -47.2
Region	Mendoza, Río Negro & Neuquén Provinces
Country	Argentina
Extent	Neuquén Basin
Type section
Named for	Sierra del Portezuelo
Portezuelo Formation (Argentina)

The Portezuelo Formation is a geologic formation of Late Cretaceous (Late Turonian to Early Coniacian) age, outcropping in the Mendoza, Río Negro and Neuquén provinces of Argentina.^[1] It is the fourth-oldest formation in the Neuquén Group and the older of the two formations in the Río Neuquén Subgroup. Formerly, that subgroup was treated as a formation, and the Portezuelo Formation was known as the Portezuelo Member.^[2]