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Paleobiota of the Yixian Formation
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Paleobiota of the Yixian Formation : ウィキペディア英語版
Paleobiota of the Yixian Formation

The Yixian Formation () is a geological formation in Jinzhou, Liaoning, People's Republic of China, that spans about 5 million years during the early Cretaceous period (early Aptian stage). It is known for its fossils, listed below.
The Yixian Formation is divided into the following subunits, from most recent to oldest: (ages when available from Chang et al., 2009〔Chang, S. C., Zhang, H., Renne, P. R., & Fang, Y. (2009). "High-precision 40Ar/39Ar age for the Jehol Biota". ''Palaeogeography, Palaeoclimatology, Palaeoecology'', 280(1), 94-104.〕)
* Jingangshan Bed (youngest, 122.1 Ma)
* Dawangzhangzi Bed
* Lujiatun Bed (123.2 Ma)
* Jianshangou Bed (124.1 Ma)
* Basalt base (oldest, 129.7 Ma)
==Amphibians==


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