| 吉林南部晚寒武世凤山期三叶虫动物群兼论寒武－奥陶系界线 |
| |
| 摘 要： | 吉林南部晚寒武世及早奥陶世地层层序连续完整，三叶虫化石丰富。本文将上寒武统凤山阶划分为５个生物带，并与有关地区进行对比，讨论了寒武－奥陶系界线。三叶虫包括５３个种，分属２６个属。由于篇幅所限，仅描述少数属种。
|
| 关 键 词： | 寒武纪，凤山组，生物地层分带与对比，寒武－奥陶系界线 |
LATE CAMBRIAN FENGSHANIAN TRILOBITES OF SOUTHERN JILIN WITH SPECIAL REFERENCE TO THE CAMBRIAN-ORDOVICIAN BOUNDARY |
| |
| Authors: | Guo Hongjun |
| |
| Institution: | Guo Hongjun(Kuo Hungchun);Ding Xuan(Department of Earth Sciences) |
| |
| Abstract: | Seventeen species of late Cambrian trilobites,belonging to twelve genera, are described from the Fengshan Formation at the Dayangcha and Qinggouzi sections ofsouthern Jilin. Two species are described as new.Five succesive biozones,described as assemblage-zones,are recognised on themeasured sections of the Fengshan Formation. These are as follows in descending order:Lower Ordovician(Tremadoc)Yeli Formation Pseud okainella-Dictyonema flabelliforme-Staurograptus dichotomus Zonc Upper Cambrian Fengshanian 5.Richard sonella Zone 4. Mictosaukia Tone 3.Changia Zone 2.Quadraticephalus-Lophosaukia Zone 1. Ptychaspis-Tsinania Zone It now seems,appropriate to place the base of the Ordovician at the first appearanceof the planktonic graptolite Dictyonema flabelliforme-Staurograaptuss dichotomus fauna in the Dayangcha section 0.54 m below the first appearance of Cordylod us lind stromi.Inother words,the Cambrian-Ordovician boundary should be drawn between theRichard sonella Zone and the Pseudokainella-Dictyonema flabelliforme-Staurrograptusdichotomus Zone. |
| |
| Keywords: | Cambrian Fengshan Formation biozonation and correlation Cambrian-Ordovician boundary |
| 本文献已被 CNKI 等数据库收录！ |
