The Papo Seco Formation is a geological formation in Portugal, whose strata date back to the Early Cretaceous. Dinosaur fossils are among the fossils that have been recovered from the formation.

Hadrosauroidea is a clade or superfamily of ornithischian dinosaurs that includes the "duck-billed" dinosaurs, or Hadrosauridae, and all dinosaurs more closely related to them than to Iguanodon. Their