1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Key- Lab for Oil Shale and Coexistent Energy Minerals of Jilin Province��Changchun 130061��China; 3. Key- Lab of Evolution of Past Life and Environment in NE Asia��MOE (Jilin University)��Changchun 130026��China; 4. Department of Geology��University of Toronto��Toronto M5S 3B1��Canada

This paper systematically studies the Eocene palynological characteristics in Huadian Basin��and quantitatively reconstructs the Eocene climatic change��adopting method of the Coexistence Approach (CA)�� 85 genera and 100 species are identified in the Eocene Huadian Formation��which indicates that the palynoflora is characterized by the dominance of angiosperm pollen��and Quercoidites��Alnipollenites��Ulmipollenites and Tiliaepol- lenites are overwhelmingly predominant among the angiosperm pollen�� The contents of gymnosperm pollen and fern spores are lower�� The palynological assemblages show that the tropical- subtropical taxa are some abundant��while lower than temperate and subtropical taxa in contents��which indicates a northern subtropical warm and humid cli- mate�� The Eocene climate of Huadian Basin is quantitatively reconstructed by the Coexistence Approach��in which the MAT (13. 6 ��18. 4��)��MWMT (23. 6�� ��27. 9��)��MCMT (5. 5�� ��7. 8��)��MAP (887 ��1 206 mm)�� HMP (187 ��236 mm)��LMP (16 �� 41 mm) and WMP (45 �� 143 mm) are estimated�� The comparison of pa- lynofloras and palaeoclimates between the Huadian and Hunchun basins in eastern Jilin Province suggests that the Eocene climates of the two basins are very similar��i�� e�� both are warm and humid��