PERMIAN SPORO-POLLEN ASSEMBLAGES OF THE JIYANG DEPRESSION, SHANDONG PROVINCE

In order to establish stratigraphic correlation, palynological samples from the drills for prospecting oil and gas of Qugu 2,Qugu 3 and Yi 136 were analyzed in the Jiyang Depression of Shandong Province. Five samples have yielded sporo-pollen fossils. They are Qugu 2-3(2 843.2 m), Qugu 3-34(4 059 m), Qugu 3-23(4 041 m), Qugu 3-13( 4 013 m) and Yi 136-5(3 772.6 m). Fifty-nine genera and 119 species of sporo-pollen fossils have been found. According to the vertical changes of the components and contents of sporo-pollen fossils, 3 assemblages may be distinguished as follows (from lower to upper): Ⅰ.Cyclogranisporites -Granulatisporites-Laevigatosporites assemblage(lower part of Shanxi Formation), Ⅱ.Punctatisporites - Cyclogranisporites-Florinites assemblage (upper of Shanxi Formation), Ⅲ.Macrotorispora-Vesicaspora-Pteruchipollenites assemblage (upper Shihezi Formation). Compared with the assemblages in other areas of North and South China, the geological age of the assemblages in the Jiyang depression should be middle Early Permian (assemblagesⅠand Ⅱ), or early Late Permian (assemblage Ⅲ). Because sporopollen fossils have not been found in the Lower Shihezi Formation, the assemblage has not been set up. More research work should be done in the future.