Paleobiota of the Yixian Formation
Geological formation in China / From Wikipedia, the free encyclopedia
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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[1] 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)