Hasandong Formation

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 have been discovered from this formation, though no genus is considered valid as of 2016. Other reptiles from the formation include the adocid turtle Proadocus and possibly the pterosaur Dsungaripterus.

Invertebrate fossils
Few fragments of insects have been discovered from the formation.

Ostracods
Ostracod carapaces have been discovered from the formation.

Testudines
Shell fragments of testudines have been discovered.

Crocodylomorpha
Several teeth remains have been reported but are not assigned to the specific clade.

Dinosaurs
Several indeterminate theropod teeth remains have been reported.

Eggs
Unnamed dinosaur egg fossils have been reported.

Ichnofossils
Tracks of theropods, sauropods and ornithopods have been discovered from the formation.

Paleoflora
Consists of 6 genera and 9 species. The assemblage of plant fossils from the Hasandong represents the 'mixed' type of Tetori-type and Ryoseki-type flora.