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About: Paleobiota of the Yixian Formation     Goto   Sponge   NotDistinct   Permalink

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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 fossils, listed below. 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)