【摘要】 本文记述了吉林珲春产的以元叶属为主的植物化石,介绍了元叶属的形态特征及其地质、地理分布。通过与有关植物群的对比,确定珲春植物群的时代为赛诺期。鉴于元叶属化石的环北太平洋的分布,可以认为北太平洋两岸在晚白垩世曾有过某种形式的陆地联系。文中记述了分属于8属的14种植物化石,其中有6个新种。更多还原

【Abstract】 The present paper deals with fossil plants collected from the“Hunchun”For-mation in Hunchun of Jilin.The so-called Hunchun flora comprises 8 genera and 14 species,of which 6 spe-cies are described as new.They are:Juglandites poliophyllus sp.nov.,Protophyl-lum cordifolium sp.nov.,P.microphyllum sp.nov.,P.ovatifolium sp.nov.,P.reni-folium sp.nov.and P.rotundum sp.nov.,So far as is known,the discovery of Proto-phyllum in the Hunchun flora is the first record in China.In this paper,the genus Protophyllum is described in detail,mainly its morpho-logical features and its geologic and geographic distributions.A comparison with the Cretaceous floras of North America and Northeast Asiasuggests that the Hunchun flora is of Late Cretaceous,probably Senonian or earlierin age.Some authors have pointed out the fact that in the Cretaceous both the florasand the vertebrates are similar in the nuthern Circum-Pacifie belt.Taking accountof the distribution of Protophyllum in northern Circum-Pacific,the present authorstend to believe that the two coastal regions of the northern Pacific Ocean were onceconnected with each other in the Late Cretaceous.更多还原