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作 者 ：冯广平 王宇飞 李承森

期 刊 ：植物学通报 2000年 17卷 专辑期 页码：74-83

关键词：乌云组；化石植物；孢粉；古新世；

摘 要 ：乌云组的植物化石组成和孢粉组合均以被子植物为主。化石植物组成中，第三纪成分明显占优势，占种子植物总属数的41％，白垩纪成分比例较小，仅占9％。乌云植物群与东亚和北美部分马斯特里赫特期至始新世的植物群的对比结果表明：乌云植物群与俄罗斯结雅—布列亚盆地的基甫金古新世植物群的面貌最为接近。同时，乌云组的孢粉组合也显示：乌云组中的大多数孢粉类型见于古新世，其孢粉组合与东亚和北美的古新世地层的孢粉组合相似。因此，乌云组的地质时代宜划归古新世。

Abstract:Fossil plants of the Wuyun Formation are dominated by angiosperms. Eighteen genera of seed plants (41% to the total genera) are confined to Tertiary, and nine of them (9% to the total genera) are confined to the Late Cretaceous. The Wuyun flora has more common elements with the Kivdin Flora (Paleocene) of Russia than with other floras of the Late Cretaceous to Eocene in East Asia and North America. On the other hand, the pollen assemblage of the Wuyun Formation is comparable to those of Palcocene strata in East Asia and North America. The age of Wuyun flora might be assigned to Paleocene rather than the Late Cretaceous.

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