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辽西是我国著名的中生代陆相地层发育地区之一,尤以产著名的“热河生物群”而闻名于世。辽西中生代地层的研究历史悠久,前人曾做了大量的工作,积累了丰富的地层古生物资料,最早可追溯到本世纪20年代。随着我国陆相侏罗—白垩系界线研究工作的深入开展,长期以来人们围绕着辽西义县组的时代归属问题展开了激烈的讨论。近几年来,由于北票四合屯—尖山沟一带大量原始鸟类、鹦鹉嘴龙、翼龙、昆虫和植物等化石的发现,这
The western Liaoning is one of the famous Mesozoic terrestrial strata development areas in China, especially famous for its “Rehe Biota”. The study of the Mesozoic strata in western Liaoning has a long history. Many people have done a great deal of work before and accumulated abundant paleosol data, dating back to the 1920s. With the in-depth study of the continental Jurassic-Cretaceous boundary in China, there has been a heated discussion about the ownership of the times in the Yixian Formation in western Liaoning for a long time. In recent years, due to the discovery of a large number of fossils such as primitive birds, psittacos, pterosaurs, insects and plants in Sihetun-Jianshangou, Beipiao,