Sinuiju Formation

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]

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	40.1°N 124.4°E / 40.1; 124.4
Approximate paleocoordinates	43.8°N 125.8°E / 43.8; 125.8
Country	North Korea
Type section
Named for	Sinuiju city
Sinuiju Formation (North Korea)

Fossil content

Fish

Fish from the Sinujiu Formation
Genus	Species	Material	Notes	Member	Images
Lycoptera	L. sp.[1][2]
Acipenseriformes	Acipenseriformes indet.[1][2]

Amphibians

Amphibians from the Sinujiu Formation
Genus	Species	Material	Notes	Member	Images
Anura	Anura indet. (PossiblyLiaobatrachus grabaui).[4]

Pterosaurs

Pterosaurs from the Continental Teriminal Formation
Genus	Species	Material	Notes	Member	Images
Jeholopterus	J. cf. ningchengensis[5]	Specimen CKGP 19960828, formerly PS198922[5][6]
Pterosauria	Indeterminate	Specimen PS199921[7]

Dinosaurs

Birds

Birds from the Sinujiu Formation
Genus	Species	Material	Notes	Member	Images
Confuciusornithidae	Confuciusornithidae indet. [1][2]		(Includes the fossil known colloquially as the Archaeopteryx of Korea)
Enantiornithes	Enantiornithes indet.[1][2]
Ornithurae	Ornithurae indet.[2]

Non-Avian Dinosaurs

Dinosaurs from the Sinujiu Formation
Genus	Species	Material	Notes	Member	Images
Dinosauria	Dinosauria indet	A single tooth[7]

Mammals

Proboscideans from the Continental Teriminal Formation
Genus	Species	Material	Notes	Member	Images
Multituberculata	Multituberculata indet.[8]

Insects^[9]

[[Insect]ns from the Sinujiu Formation
Genus	Species	Material	Notes	Member	Images
Angarosphex	A. baektoensus
Ephemeropsis	E. sp
Karataus	K. ryonsangensis
Sinuijumantispa	Sinuijumantispa ryonsangiensis[10]
Stenophlebia	Stenophlebia ryonsangensis[11]
Stellularis	Stellularis sinuijuensis
Sinuijus	Sinuijus baektoensis
Sinuijuhelorus	Sinuijuhelorus baektoensis
Pompilopterus	Pompilopterus ryonsangensis

Conchostracans

conchostracans from the Sinujiu Formation
Genus	Species	Material	Notes	Member	Images
Eosestheria	E.sp.	A conchostracan[2]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with few dinosaur genera