Portezuelo Formation
Geologic formation in Argentina / From Wikipedia, the free encyclopedia
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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]
Quick Facts Type, Unit of ...
Portezuelo Formation | |
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Stratigraphic range: late Turonian–early Coniacian ~90.5–88.5 Ma | |
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 | 38.5°S 68.7°W / -38.5; -68.7 |
Approximate paleocoordinates | 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 |
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