【摘要】 本文所论述的,在燕山地区怀来、兴隆等地青白口系景儿峪组长龙山亚组发现的龙凤山藻属,是至今发现最早具器官分化的个体植物化石。并可能是最早具固着器的宏观藻类化石。根据其形态特征鉴定出1个属,4个种。长龙山亚组的同位素年龄在860—900百万年间。更多还原

【Abstract】 This paper chiefly describes the locality, occurring horizon, structural features and identification of the mega alga Longfengshania from the Qingbaikou System in the Yanshan Mountain Area and discusses the primary morphology, ecological features, evolution and assignment of the genus.The fossils discussed here were collected from the midlower to basal greyish-green to greyish-black illitie shales of the second member of Changlongshan Subformation in both Longfengshan of Huailai County and Lishugou of Xinglong County, Hebei Province, the age of which ranges from 860—900 my..The fossil bodies are composed of two parts, foliate and sub-leafstalk, with some of the latter having rhizoidal fixation organs at their bases. Such differentiation of algal forms and organs is an important evidence of multicellular organism marking the evolution of primary metaphyte. These fossils are probably the oldest mega benthic algae. The appearance of sub-leafstalk and fixation organ are highly significant in taxonomy. On the basis of forms and contacts of their foliates and sub-leafstalks, the algae discussed are identified as 1 genus with 4 species, one of which is a new species, namely Longfengshania longipetiolata Du et Tian (sp. nov.).更多还原