The Vaca Muerta Formation, commonly referred to as Vaca Muerta, is a geologic formation dating from the Late Jurassic to Early Cretaceous periods. It is situated within the Neuquén Basin in the northern region of Patagonia, Argentina.
The formation is primarily recognized for its geological significance as a major host rock for substantial deposits of shale oil and shale gas. It serves as a key site for hydrocarbon extraction within the region.