| Sinuiju Formation | |
|---|---|
| Stratigraphic range: Barremian-Aptian | |
| Type | Geological formation |
| Sub-units | 8 members |
| Overlies | Precambrian basement |
| Thickness | >500 metres (1,600 ft) |
| Lithology | |
| Primary | Sandstone, siltstone, mudstone |
| Other | Andesite |
| Location | |
| Coordinates | 40°06′N 124°24′E / 40.1°N 124.4°E |
| Approximate paleocoordinates | 43°48′N 125°48′E / 43.8°N 125.8°E |
| Country |  North Korea |
| Type section | |
| Named for | Sinuiju city |
  Sinuiju Formation (North Korea) | |
The Sinuiju Formation(신의주층) is a geologic formation in North Korea. Formerly of uncertain age, it is now thought to be Early Cretaceous. A variety of fossils are known from the formation, including those of anurognathid pterosaurs (possibly Jeholopterus) and birds such as the specimen of a very large enantiornithine with a 5 cm (2.0 in) long tibia and a 3.5 cm (1.4 in) long pygostyle. Frogs have also been found in the formation.[1][2] Numerous compression fossils of insects have also been found.[3]
- ^ Cite error: The named reference
gaoetalwas invoked but never defined (see the help page). - ^ Choi, S.; Lee, Y.N. (2017). "A review of vertebrate body fossils from the Korean Peninsula and perspectives". Geosciences Journal. 21 (6): 867–889. Bibcode:2017GescJ..21..867C. doi:10.1007/s12303-017-0040-6. S2CID 133835817.
- ^ Jon, SuHyang; Won, CholGuk; So, KwangSik; Nam, TuYong (July 2019). "New Mesozoic insect fossils from the Democratic People's Republic of Korea". Cretaceous Research. 99: 240–245. Bibcode:2019CrRes..99..240J. doi:10.1016/j.cretres.2019.02.019. S2CID 134337948.