The Yixian Formation also yielded Sinosauropteryx, the first physical evidence of a feathered dinosaur.
古生物学家在义县组发掘出了中华龙鸟，它是羽毛恐龙的首个直接物证
Description: The Yixian formation of China contains a panoply of exquisitely - preserved insects, vertebrates, and plants.
描述：中国的义县组产出的化石种类精美绝伦，种类繁多，昆虫、脊椎动物，还有植物。
Bird fossils were for the first time discovered in the bottom of the Jurassic Yixian Formation in the north of Fengning county, Hebei.
河北省丰宁县北部侏罗系义县组底部首次发现鸟类化石。
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