• Source: Yanan Formation

The Yanan Formation, alternatively spelled the Yan'an Formation (Chinese: 延安组), is a geological formation in China, it is also alternatively considered a group. The age of the formation is uncertain, with estimates ranging from Toarcian to Bajocian. It is divided up into 5 members, with the designation of Y1 through Y5. Y2, Y3 and Y4 are predominantly dark shales, while Y1 and Y5 are composed of sandstones, coal beds and interbedded mudstones. The depositional environment at the time was when the Ordos Basin formed a large inland lake, surrounded by floodplains. The dark shales have been explored for the potential of producing shale gas. The coal has also been explored for the production of coalbed methane. The formation is also notable for its fossil content, with dinosaur footprints having been found in the formation. The dinosaur Lingwulong was formerly thought to have been found in this formation, but the strata was later attributed to the overlying Zhiluo Formation.




Fossil content






= Dinosaurs

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Sauropods





References

Kata Kunci Pencarian:

• Yanan Formation
• Zhiluo Formation
• Lingwulong
• Cercopoidea
• 2023 in paleoentomology
• 2018 in non-avian dinosaur paleontology
• List of Asian dinosaurs
• 2023 in paleobotany
• Borucice Formation
• Shensipus