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报道一个产于上泽亚(Uupper Zeya)坳陷(东经129-130°,北纬54-55°)东南部,保存良好的化石孢粉植物群。孢粉组合中裸子植物花粉居统治地位,占总数的53.4％,其中Taxodiaceae占36.3％,松科仅占5％。被子植物花粉占39.9％,多为茅荑花序类,如胡桃科、桦木科、山毛榉科等;同时还有不少反映温暖气候的分子,如Liquidambar,Balsaminaceae,Magnoliaceae,Nyssaceae等。孢子植物占21％。这样的孢粉植物群代表了潮湿温暖的温带气候。孢粉学至今在坳陷区内仍是人们用以确定地层时代的唯一依据。Pistillipollenites macgregorii,Anacolosiditessuplingensis,Ulmoideipites tricostatus及U.crempii等的出现可以确定含孢粉地层的地质时代属于中-晚始新世。斯涅日诺戈斯克产煤区中-晚始新世沉积中的孢粉层位与普里阿姆尔耶,雅库提亚和亚洲东北部的同期沉积相当。
A well-preserved fossil-bearing sporopollen assemblage was reported in the southeastern Uupper Zeya depression (129-130 ° E, 54-55 ° N). Pollen assemblages in gymnosperm pollen dominance, accounting for 53.4% of the total, of which Taxodiaceae accounted for 36.3%, Pinaceae only 5%. The angiosperm pollen accounted for 39.9% of the total, mostly catkin inflorescences, such as the walnut family, birch family, beech family; at the same time there are many molecules that reflect the warm climate, such as Liquidambar, Balsaminaceae, Magnoliaceae, Nyssaceae and so on. Spore plants account for 21%. This pollen flora represents a warm and humid climate. Palynology so far in the depression area is still the only basis for people to determine the age of the formation. The emergence of Pistillipollenites macgregorii, Anacolosiditessuplingensis, Ulmoideipites tricostatus and U.crempii and so on can confirm that the geologic age of sporopollen strata belongs to the middle-late Eocene. The sporopollen beds in the Meso-Late Eocene sediments of Sneznogorsk coal-producing area are comparable with the contemporaneous depositions in Priamula, Yakutia and northeastern Asia.