page_title: Portezuelo Formation
section_title: Fossil content
hierarchical_section_title: Portezuelo Formation / Fossil content
caption_attribution_description: English: Juvenile Megaraptor namunhuaiquii Tom Parker, Pencil 2015
context_page_description: The Portezuelo Formation is a geologic formation of Late Cretaceous age, 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.
context_section_description: Many dinosaur fossils have recently been described from this formation, as well as remains of several other types of animals:
  teleosteid fish including Leufuichthys
  abundant and diverse turtles including Portezueloemys and a species of Prochelidella
  titanosaurian sauropods including Malarguesaurus, Futalognkosaurus, Baalsaurus
  dromaeosaurid theropods (Neuquenraptor, Unenlagia, Pamparaptor)
  a Megaraptorid theropod (Megaraptor)
  an alvarezsaurid theropod (Patagonykus)
  several other theropods, including a modern, possibly galliform bird
  ornithopods including possible iguanodonts
  a possible azdarchoid pterosaur Argentinadraco
caption: Megaraptor namunhuaiquii
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