根据孢粉推论禄丰腊玛古猿生活时期的自然环境

<正> 前言1975年,云南禄丰石灰坝煤窑中发现了腊玛古猿的牙齿.后经进一步发掘,找到了完整的腊玛古猿下颌骨,以及腊玛古猿、西瓦古猿的牙齿,并采得大量的其他动物化石.腊玛古猿现在被认为是人科的第一个成员,是从猿到人的过渡类型,它可能代表人类

PALEOENVIRONMENT DURING THE TIME OF RAMAPITHECUS LUFENGENSIS

A palynological study is made from the section to show the paleoenvironmentduring the time of Ramapithecus.Three spore-pollen assemblages are recorded show-ing three develomental stages of the paleoenvironment during the time of Ramapit-he■us.Ⅰ.Lower spore-pollen assemblage is obtained from a black clay of the lower partof the section,where no fossil Ramapithecus is found.This assemblage is marked byoccurence of fern spores of Polypodium,Neolepisorus and Pteris etc.and pollen ofSaururus,Alnus,Quercus,Castanopsis,Rhus,Betula and Cycas.It indicats that awarmhumid climate prevailed at that time.Ⅱ.Middle spore-pollen assemblage is discovered from the lignit,from which thefossil Ramapithecus is unearthed.This assemblage is predominant by Myrica andAlnus,Myrica esculenta,M.rubra,M.nana,Alnus nepalensis,Quercus,Castanopsis,Carpinus,Carya,Engelhardtia,Monocelastrum,Tarenna,Symplocos,Melia,Ilex,Poly-gonum,Fatoua,Saururus,Calamus,and some elements of Caryophyllaceae,Ranucu-laceae,Umbelliferae and other families are recorded.The microflora shows that mixedforests were flourishing during the period of existence of Ramapithecus,Some mea-dows 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 uppermostpart of the section,which is characterized by abundance of dissacate pollen mainly ofPinus and along with some of Keteleeria,Tsuga and Picea,that indicats a drop inthe temperate.In concusion,during the time of the Ramapithecus,the climate changed fromwarm-humid to warm-drier and then cooler-humid.The lower assemblage can be com-pared with lower Sivalik Group which is of middle Miocene in age.The middle andupper assemblages can be compared with the middle and upper parts of Middle Siwalikgroup and belong to late Miocene-early Pliocene.