| Papo Seco Formation | |
| Type: | Geological formation |
| Age: | Early Barremian ~ |
| Period: | Barremian |
| Prilithology: | Mudstone, siltstone |
| Otherlithology: | Sandstone |
| Region: | Setubal |
| Coordinates: | 38.4°N -9.2°W |
| Paleocoordinates: | 31.8°N 1.3°W |
| Underlies: | Assises à Orbitolines Formation |
| Overlies: | Porto da Calada Formation |
| Extent: | Lusitanian Basin |
The Papo Seco Formation is a geological formation in Portugal, whose strata date back to the Early Cretaceous.[1] Dinosaur fossils are among the fossils that have been recovered from the formation.[2] [3]
The unit was previously referred to as the "Gres a Dinosauriens", due to the abundant dinosaur remains found in the past.[4]
The Papo Seco Formation (Rey, 1992) marks the return to clastic-dominated sedimentation. Exposure of the formation is found above the low cliff between Rochadouro and Areia do Mastro, and on the foreshore and beach at Boca do Chapim. The Papo Seco Formation is dominated by silty mud-mud deposition. This is interbedded with medium to coarse, commonly ribbon shaped, clastic sandstones. Along the exposure, between Rochadouro and Boca do Chapim, the clastic sands are not laterally continuous. The exposure clearly shows that the ribbon sands are isolated and change laterally into muds. Three distinct sand facies have been identified within the Papo Seco Formation.[4]
| Dinosaurs of the Papo Seco Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
| Dromaeosauridae indet.[5] | Indeterminate | Praia do Areia do Mastro | ||
| Iberospinus | I. natarioi[6] | Praia de Aguncheiras | Was once thought to be a specimen of Baryonyx. | |
| Suchosaurus | S. girardi | Boca do Chapim | Was considered a species of Baryonyx | |
| Titanosauriformes indet. | Indeterminate | Boca do Chapim | Was referred to "Pleurocoelus" valdensis | |
| Theropoda indet. | Indeterminate | Boca do Chapim | Including Megalosaurus superbus, now known as Erectopus" | |
| Theropoda indet. | Indeterminate | Praia do Areia do Mastro | ||
| Ornithopoda[7] | Indeterminate |
| Previous supposed reports of Mantellisaurus and Iguanodon cannot be substantiated | |
| Iguanodontia | ||||
| cf. Styracosterna | ||||