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]

TypeGeological formation

Sub-units8 members

OverliesPrecambrian basement

Thickness>500 metres (1,600 ft)

Quick facts Type, Sub-units ...

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)

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