Hasandong Formation
| Hasandong Formation | |
|---|---|
| Stratigraphic range: Aptian-Albian ~ | |
| Type | Geological formation |
| Unit of | Shindong Group |
| Underlies | Jinju Formation |
| Overlies | Nakdong Formation |
| Thickness | 1,200 metres |
| Lithology | |
| Primary | Mudstone |
| Other | Shale, sandstone |
| Location | |
| Coordinates | 35°06′N 128°00′E / 35.1°N 128.0°E |
| Approximate paleocoordinates | 41°18′N 128°06′E / 41.3°N 128.1°E |
| Region | Gyeongsang Province |
| Country | South Korea |
| Type section | |
| Named for | Hasandong(Now called Hasan-ri), Daegu |
| Named by | Tateiwa, 1929 |
The Hasandong Formation (Korean: 하산동층; Hanja: 霞山洞層; RR: Hasandong-cheung) 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.