����ʡ����������һ���߷ۻ�ʯ�ḻ�����¶��ϻ���5 ���߷���ϡ�Z1 ����߷ۻ�ʯ���٣���Ϊ�Ž�ϵ�����߷ۣ�ż������ۣ�ʱ��Ϊ��ʼ����; Z2 ��ϳ���ʼ���������������Ʒۣ�����С��ӥ�ۡ����ڷۼ�����۵����dz��֣�ʱ��Ϊ����ʼ����; Z3 ���ާ��ֲ�����Ӻ���Ϊ�������ֵ���ݱ�����ֲ�ﻨ�۽�Z1��Z2 ����������ӣ�ʱ��Ϊ�罥����; Z4 ����Ժ��϶��ާ��ֲ��ݱ�����ֲ�ﻨ����Z3 ����൱��ʱ��Ϊ������; Z5 ��ϲݱ�����ֲ�ﻨ�ۺ����ϸߣ����������ֵ�����������+ ޼��+ �շ�+ �̱��۵�Ϊ����ʱ��Ϊ��������

Abundant sporo-pollen fossils are found in Well Wancan 1 of Wanchang area in Jilin��which can be divided into 5 palynomorph assemblages in ascending order�� In the Z1 assemblage aged in early Eocene��the sporo-pollen fossils are less in amount��and common in Paleogene for occurrence��with Plicapollis seen occasionally�� In the Z2 assemblage aged in middle--late Eocene��Pistillipollenites characteristic for Eocene��and assciated with Aquilapollenites spinulosus��Gothanipollis and Plicapollis occurred sporadically�� In the Z3 assemblage aged in early Oligocene��the fern spores reach a peak in quantity for this profile��and the herbaceous angiosperm pollen more increased than those in Z1 and Z2 assemblages�� In the Z4 assemblage aged in late Oligocene��more fern spores still occurred while herb aceous angiosperm pollen are similar to those of Z3 assemblage in content�� The Z5 assemblage has a peak of herbaceous angiosperm pollen in contents for this profile��particularly shown by Artemisiaepollenites + Chenopodipollis + Compositoipollenites + Graminidites��which indicates Miocene in age��