Abstract: The section here concerned is situated in village Zhoujiayoufang, being on the southern slope of a loess terrace between the Songhua and Lalin rivers.A great amount of spore-pollen grains of arboreous, herbaceous and fern plants were found in the sediments of the middle and lower section. They mainly belong to genera Pinus, Picea, Betua, Carpinus, Salix, Artemisia and families Chenopod-iaceae, Gramineae, Umbelliferae or species Betula nana etc.The pollen assemblage described here indicates that the vegetation developed in the v. zhoujiayoufang during the Late Pleistocene time may represent a forest-steppe type.Many cool-temperate plant elements discovered, such as Picea, Bothychium, Betula nana prevanana, imply that in Late Pleistocene time the cold and moist climate was iling in the study area. Therefore, to authors' opinion, the second terrace was formed in the late stage of Late Pleistocene.

摘要： 本文是对吉林榆树周家油坊二级阶地沉积进行孢粉分析的总结。从孢粉资料可以说明,沉积物堆积时期的古植被属森林草原类型,气候寒冷较湿。通过孢粉组合对比,二级阶地形成的时代为晚更新世晚期。 周家油坊在吉林省榆树县西南18公里,因该处二级阶地盛产第四纪哺乳动物化石,所以该地不仅成为东北地区第四纪的“标准”地层之一,也尝有“榆树动物群”之称。但因化石层位欠清,所以在地质时代等问题上仍存争议。为了探讨“榆树动物群”的生活环境及阶地沉积的地质时代,建立该区第四纪孢粉地层层序,在二级阶地采集了一些样品进行孢粉分析。