Hasandong Formation
Introduction The '''Hasandong Formation''' () is an Early Cretaceous (Aptian to Albian) geologic formation in South Korea. It has been dated to the late Aptian and earliest Albian, between 118.0 ± 2.6 Ma and 112.4 ± 1.3 Ma. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation. Tracks of the pterosaur ichnospecies ''Pteraichnus koreanensis'' have also been recovered from the unit.
Fossil content === Paleofauna ===* ''Hadongsuchus acerdentis'' - nomen nudum* Tyrannosauroidea indet. - "Tooth. "* Carcharodontosauridae indet. - "Several teeth remains. "* Titanosauriformes indet. -"Several teeth remains. "* ''Pukyongosaurus milleniumi'' - "Cervical and dorsal vertebrae, ribs, limb and girdle elements. "* Hadrosauroidea indet. - "Tooth. "* Pterodactyloidea indet. (belongs to either Boreopteridae or Anhanguerian)* Boreopteridae indet. * Dsungaripteridae indet. * ''Sinamia'' sp. * ''Proadocus hadongensis'' - a turtle* ''Sauripes hadongensis'' - an ichnotaxon (the oldest lizard trackway; shows bipedalism)* ''Pteraichnus koreanensis'' - pterosaur ichnotaxon* ''Testudoolithus'' aff. ''curiosa'' - turtle ootaxon=== Paleoflora ===Source:*''Thallites'' (''T. yabei'') - liverworts*''Onychiopsis'' (''O. elongata'') - leptosporangiate ferns*''Cladophlebis'' (''C. denticulata'', ''C. shinshuensis'', ''C.''/''Eboracia''? ''lobifolia'' and ''C.''/''Klukia''? ''koraiensis'')*''Brachyphyllum'' (''B. japonicum'')*''Elatocladus'' (''E. tennerima'')*''Taeniopteris'' (''T.''? sp. and cf. ''T. auriculata'') - cycad ferns
See also * List of dinosaur-bearing rock formations** List of stratigraphic units with few dinosaur genera* Seonso Conglomerate* Haman Formation
References === Bibliography ===*