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。
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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