The age of Paleogene strata in the Pingyi-Mengyin area, Shandong, China

The authors conducted field geological survey and measured stratigraphic sections of Paleogene strata in the Pingyi-Mengyin area, Shandong, and on that basis, they made a detailed study and stratigraphic division of the Paleogene distributed in the study area and provided new ESR age data. According to these new data, combined with the biostratigraphic sequence, the Paleogene lithostratigraphic sequence in the area is defined as follows (in descending order): Oligocene Wendong Formation (E3w), upper Eocene Dawenkou Formation. (E23d), middle Eocene Zhujiagou Formation (E22z), lower Eocene Changlu Formation (E21c), upper Paleocene Bianqiao Formation (E12b) and lower Paleocene Gucheng Formation (E11g). This study provides an important basis for the study and stratigraohic division and correlation of the Paleogene in North China and even throughout China.