中文摘要：

通过对豫西北奥陶系马家沟组的岩性、实体化石与遗迹化石组分及分布特征分析,对层序格架内遗迹化石垂向分布特征进行研究,在以遗迹化石为界面识别标志的基础上,建立了层序地层格架,将马三段划分为1个Ⅲ级层序（SQ）、2个Ⅳ级层序（St1,St2）以及10个Ⅴ级准层序（Psq1—Psq10）,对各准层序内对应的遗迹化石发育特征及垂向演化进行分析,对研究华北奥陶系层序地层划分有借鉴意义。

英文摘要：

Based on the composition and distribution characteristics of lithological characters, body fossils and trace fossils, sequence stratigraphy and the distribution characteristics of ichnofabricsin vertical. On the basis of using trace fossils interface identification marks,this paper established the sequence stratigraphic framework, and the third member of the Majiagou Formation is divided into 1 third-order sequence （SQ） ,2 fourth-order sequences （ St1, St2 ） and 10 fifth-order parasequences （ Psq1 - Psq10）. Analyzed the develop- ment characteristics and vertical evolution of the corresponding trace fossils in each sequence. This study has great reference significance in reconstructing the Ordovician sequence classification of North China Basin.