Which geologic formation is found in the northern edge of Patagonia?
Portezuelo Formation The Portezuelo Formation is a geologic formation outcropping in the Mendoza, Río 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 Río Neuquén Subgroup. Formerly, that subgroup was treated as a formation, and the Portezuelo Formation was known as the Portezuelo Member.
Curré Formation The Curré Formation is a geologic formation in Costa Rica. It preserves fossils dating back to the Neogene period.