Paleobiota of the Yixian Formation

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The Yixian Formation (simplified Chinese: 义县组; traditional Chinese: 義縣組; pinyin: Yìxiàn zǔ) is a geological formation in Jinzhou, Liaoning, People's Republic of China, that spans about 1.6 million years during the early Cretaceous period (Barremian-Aptian stage). It is known for its diverse fossils, listed below. These include dinosaurs, pterosaurs, mammals, amphibians, fish, and various invertebrates. The Yixian Formation is divided into the following subunits: (ages from Zhong et al., 2021 unless otherwise noted) Upper Yixian (124.1 Ma) ("Jingangshan Bed") ("Dawangzhangzi Bed") Upper Lava Unit Jianshangou Unit (125.46 Ma) Lower Lava Unit Lujiatun Unit (125.76–125.68 Ma)

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