Abstract: This paper summarizes the recent discoveries of Mesozoic birds from Late Jurassic to Early Cretaceous in Liaoning, China. Most of these fossils can be refered to the avian subclass: Sauriurae, only Chaoyangia to Ornithurae. The earliest diversification and big development of birds from Late Jurassic to Early Cretaceous as well as the peculiar geological background and depositional environment in Western Liaoning constitute the main reasons for the appearance of abundant Mesozoic bird fossils in this area. In this region, the continental Jurassic- Cretaceous boundary being put between the Confuciusornis bearing Yixian Formation and the Cathayornis and Chaoyangia bearing Jiufotang Formation is proposed.

摘要： 本文对发现于辽宁中生代地层中的鸟类化石，进行了简单的总结。化石的系统分析表明，从晚侏罗世到早白垩世在这一地区存在两个亚纲的鸟类分子:蜥鸟亚纲(Sauriurae )和今鸟亚纲((Ornithurae )。其中，蜥鸟亚纲的成员不仅数量居多，而且存在较大的分异。今鸟亚纲的分子则种类和数量都相对较少。辽西中生代鸟类的大量出现，除了鸟类自身的发展原因外，晚侏罗世到早白垩世这一地区适宜的生态环境也为鸟类的繁荣提供了必要的条件。辽西地区陆相中生代地层义县组和九佛堂组的时代分别为晚侏罗世和早白垩世。