Sinuiju Formation
Introduction 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 pterosaurs and birds, including an indeterminate anurognathid and a very large enantiornithine specimen with a  long tibia and a  long pygostyle. Frogs have also been found in the formation. Numerous compression fossils of insects have also been found.
Fossil content '''Fish'''* ''Lycoptera'' sp. * Acipenseriformes indet. '''Amphibians'''* Anuran (a frog, might be referred to ''Liaobatrachus grabaui''). '''Pterosaurs'''* Anurognathidae indet. '''Birds'''* Confuciusornithidae indet. (known colloquially as the ''Archaeopteryx'' of Korea)* Enantiornithes indet. * Ornithurae indet. '''Insects'''* ''Angarosphex baektoensus''* ''Sinuijuhelorus baektoensis''* ''Sinuijus baektoensis''* ''Stellularis sinuijuensis''* ''Stenophlebia ryonsangensis''* ''Sinuijumantispa ryonsangiensi''s'''Other invertebrates'''* ''Eosestheria'' (a conchostracan)
See also * List of dinosaur-bearing rock formations** List of stratigraphic units with few dinosaur genera
References === Bibliography ===*