The fossil flora of Huadian, Jilin Province, provides an important datum as the first independently dated Middle Eocene flora from Northeastern China. Its occurrence in association with Middle Eocene mammalian fauna invites comparison with Middle Eocene floras in other parts of the Northern Hemisphere. Several megafossil plants have been reported, and work on palynoflora is now in process. The Huadian locality contains oil shales overlain directly by siltstones. The fossil mammals were found exclusively in the oil shale layer, but all the megafossil plants were found only in the siltstone. Comparison of palynoflora from both layers will gain a more correct dating about the plant megafossils. Both light microscope and SEM images are essential for describing fossil palynofloras however most prior work on pollen of Eocene East Asia was based on light microscope only. To describe the fossil pollen types in more detail, I photograph the same isolated pollen grains under both light microscope and scanning electron microscope. This complete documentation is important for correct comparison of palynoflora among different localities. Abundant pollen grains were recoverd from the overlying siltstone layer, with at least 10 different kinds of pollen type found so far, including Taxodiaceae-, Tiliaceae-, Betulaceace-, and Fagaceae-like pollen types. In general, Angiosperm pollen is dominant in the palynoflora, much less conifer or fern spores are found. Less abundant pollen grains were recovered from the oil shale, and the pollen type hasn’t been identified yet. The palynoflora, together with megafossils from the same locality, provide insight into the middle Eocene environment of Northeastern Asia. Comparison of the Huadian and other similar age floras of NE China with those of other middle Eocene localities in North America and Europe may reveal the phytogeographic origin of some taxa which were widely spread once but now endemic to China.

Key words: Eocene, Huadian, palynoflora, pollen