%0 Journal Article
%T New Knowledge on Yixian Formation<br>义县组研究的新认识
%A XING De-he
%A SUN Chun-lin
%A SUN Yue-wu
%A ZHANG Li-dong
%A PENG Yan-dong
%A CHEN Shu-wang
%A <br>邢德和
%A 孙春林
%A 孙跃武
%A 张立东
%A 彭艳东
%A 陈树旺
%J 地球学报
%D 2005
%I 
%X The Yixian Formation in western Liaoning Province comprises a set of Mesozoic continental volcanic-sedimentary rocks, which mainly consist of intermediate-basic volcanic lava, volcanic fragmental rock and lacustrine (including a little fluviatile) sedimentary rocks. The formation can be divided into four lithologic members based on the regularity of volcanic activity. From bottom to top, they are the first membei-the basal conglomerate and basic to intermediate basic volcanic member, the second member-the lacustrine sedimentary rock (or called the rare fossil layer) and acid-intermediate volcanic lithologic member, the third member-the basic, intermediate-basic, meta-alkaline volcanic member, and the fourth member-the conglomerate (including sedimentary volcanic breccia) and acid-intermediate, meta-alkaline volcanic member. There are 6 fossil layers in Yixian Formation. The basal conglomerate and basic, intermediate-basic volcanic sedimentary tuff in the first member contains abundant ancient vertebra fossils dominated by Psittacasaurus. The lacustrine sedimentary rock in the second member contains a large number of Jehol Biota fossils including the famous Sinosauropteryxprima, Confuciusornis sauctus and Archaefructus liaoningensis, thus serving as the chief fossils-bearing layer in Yixian Formation. Moreover, all the lacustrine fossil layers are synchronous. The age of Yixian Formation can be assigned to Early Cretaceous.
%K Yixian Formation
%K stratigraphy
%K age
%K Western Liaoning<br>义县组
%K 地层
%K 时代
%K 辽西
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=1DF69A47DE80569EC8F859DF61571180&aid=82E53A58B96F5AAB0386F82B7A7ADF6C&yid=2DD7160C83D0ACED&vid=96C778EE049EE47D&iid=CA4FD0336C81A37A&sid=C5154311167311FE&eid=340AC2BF8E7AB4FD&journal_id=1006-3021&journal_name=地球学报&referenced_num=2&reference_num=59