page_title: Tiaojishan Formation
section_title: Dinosaurs
hierarchical_section_title: Tiaojishan Formation / Fauna / Dinosaurs
caption_attribution_description: English: Restoration of the membrane-winged scansoriopterygid Yi qi
context_page_description: The Tiaojishan Formation is a geological formation in Hebei and Liaoning, People's Republic of China, dating to the middle-late Jurassic period. It is known for its fossil plants, and is made up mainly of pyroclastic rock interspersed with basic volcanic and sedimentary rocks. Previously, the Tiaojishan Formation was grouped together with the underlying Haifanggou Formation as a single "Lanqi Formation."
  Most researchers now agree that the Daohugou Bed, of formerly controversial dating, is a part of the Tiaojishan formation.
caption: Yi
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