DISCOVERY AND SIGNIFICANCE OF PALEOGENE ICHNOFOSSIL Paleodictyon IN THE DONGYING SAG,BOHAI BAY BASIN
Yuan Wenfang1, Chen Shiyue2, Zeng Changmin1, Hu Bin3
1. Tarim Oilfield Branch Company, China National Petroleum Corp., Korla, Xinjiang 841000; 2. College of Earth Resources and Information, China University of Petroleum, Dongying, Shandong 257061; 3. School of Resources and Environmental, Henan Polytechnic University, Jiaozuo, Henan 454100
The ichonofossil Paleodictyon was discoveved in the Paleogene turbiditic deposits in the Dongying Sag,including two ichnospecies,namely,the Paleodictyon regular and Paleodictyon majus.The study on geochemical behavior of the wall rocks revealed that the dinosterane,a sign of marine transgression,was checked out.The both meant that Paleogene sedimentation in the Dongying Sag might be once affected by seawater.