Los Molles Formation

The Los Molles Formation is a geologic formation of Early to Middle Jurassic age, located at northern and central part of Neuquén Basin at Mendoza Shelf in Argentina. It is overlain by the Niyeu–Lajas Formation.
Description.
It is the second largest oil and gas formation in the Neuquén Basin after the Vaca Muerta. Los Molles Formation is estimated to have of technically recoverable shale gas and of technically recoverable oil. In July 2015, the "Buenos Aires Herald" indicated that Pan American Energy and YPF planned to drill 46 shale gas wells in Los Molles over the next four years in their Lindero Atravesado drilling block, at an estimated cost of US$590 million.
Fossil content.
In several outcrops, the Los Molles formation has been the site of paleontological discoveries: the ichthyosaurs "Chacaicosaurus" and "Mollesaurus", and, in 2017, an ornithischian, "Isaberrysaura", discovered with fossilized contents of the gut.