作者：孙湘君 吴玉书

摘要： A palynological study is made from the section to show the paleoenvironment during the time of Ramapithecus. Three spore-pollen assemblages are recorded showing three develomental stages of the paleoenvironment during the time of Ramapithecus.
    I.  Lower spore-pollen assemblage is obtained from a black clay of the lower part of the section，where no fossil Ramapithecus is found. This assemblage, is marked by occurence of fern spores of Polypodium, Neolepisorus and Pteris etc. and pollen of Saururus, Alnus, Quercus, Castamopsis, Rhus, Betula and Cycas. It indicats that a warmhumid climate prevailed at that time.
    II.  Middle spore-pollen assemblage is discovered from the lignit，from which the fossil Ramapithecus is unearthed. This assemblage is predominant by Myrica and Alnus, Myrica esculenta, M. rubra, M. nana, Alnus nepalensis, Quercus, Castanopsis, Carpinus, Carya, Engelhardtia, Monocelastrum, Tareuna, Symplocos, Melia, Ilex, Polygonum, Fatoua, Sancrurus, Catamus, and some elements of Caryophyllaceae, Ranuculaceae, Umbelliferae and other families are recorded. The microflora shows that mixed forests were flourishing during the period of existence of Ramapithecus, Some meadows scattered here and there in the forests. The climate was rather warm and dry.
    III.  The upper spore-pollen assemblage is observed from the clay of uppermost part of the section, which is characterized by abundance of dissacate pollen mainly of Pinus and along with some of Keteleeria, Tsuga and Picea, that indicats a drop in the temperate.
    In conclusion, during the time of the Ramapithecus, the climate changed from warm-humid to warm-drier and then cooler-humid. The lower assemblage can be compared with lower Sivalik Group which is of middle Miocene in age. The middle and upper assemblages can be compared with the middle and upper parts of Middle Siwalik group and belong to late Miocene-early Pliocene.

卷期：18卷 03期

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