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.
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
The Yixian Formation also yielded Sinosauropteryx, the first physical evidence of a feathered dinosaur.
辽西凌源地区张家口组是否存在及其与义县组之间关系的问题一直存在争议。
The problems of whether the Zhangjiakou Formation exists in the Lingyuan area, western Liaoning, and its relationships with the Yixian Formation , has long been in dispute.
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。
Description: The Yixian formation of China contains a panoply of exquisitely - preserved insects, vertebrates, and plants.
以《国际地层指南》的多重地层划分观点为基础，建立了一套完整的义县组岩石岩层单位。
According to the multiple stratigraphic division of the International stratigraphic Guide, a complete column of lithostratigraphic units of the Yixian Formation has been erected.
野外工作表明辽西地区义县组碳酸盐岩夹层的发育向盆地的南侧有层数增多碳酸盐含量增加的趋势。
The field works indicate that the development of the carbonate interlayers has the tendency of increase in terms of the layers and carbonate content to the southern direction of the basin.
对辽宁西部晚侏罗世义县组中的孢粉植物群进行了系统研究，首次发现了目前为止世界上最古老的被子植物花粉化石。
This paper reports fossil pollen collected recently from the Upper Jurassic Yixian Formation of western Liaoning Province, and first demonstrates the oldest known angiospermous pollen in the world.
通过辽西义县盆地上白垩统义县组湖相碳酸盐岩碳氧稳定同位素组成，分析了赋存热河生物群的义县盆地湖湘沉积环境。
The present study made a detailed carbon and oxygen stable isotope analysis on the lacustrine carbonates from the Lower Cretaceous Yixian Formation, Yixian, western Liaoning, NE China.
辽西地区早白垩世早期义县组以产出精美的热河生物群而闻名于世，热河生物群研究的每一个重要进展都引起国内外科学家的极大关注。
The Yixian Formation becomes world well-known by fancy Jehol bita fossils, each signify headway of bita research would bring both here and abroad scientists' attention.
辽宁西部白垩系上统大兴庄组主要分布于锦州、义县地区，在朝阳波罗赤、阜新碱锅等地也有零星出露。
The Upper Cretaceous Daxingzhuang Formation in western Liaoning is mainly distributed in Jinzahou and Yixian and also outcrops sporadically in the Boluochi , Chaoyang, and Jianguo, Fuxin.
辽宁西部白垩系上统大兴庄组主要分布于锦州、义县地区，在朝阳波罗赤、阜新碱锅等地也有零星出露。
The Upper Cretaceous Daxingzhuang Formation in western Liaoning is mainly distributed in Jinzahou and Yixian and also outcrops sporadically in the Boluochi , Chaoyang, and Jianguo, Fuxin.
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