Sinuiju Formation
early Cretaceous formation in 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. Numerous compression fossils of insects have also been found.
The public source identifies “Sinuiju Formation” as early Cretaceous formation in North Korea. This brief keeps that definition visible, then builds a research path around Sinuiju, Formation and early.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated May 18, 2026. The linked authority identifier is Q7525163. Authority coordinates are 40.100, 124.400. None of the 1 selected statements returned an explicit reference.
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This entry incorporates text from “Sinuiju Formation” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.