中国斯蒂芬期植物群的基本特征

THE CHARACTER OF THE STEPHANIAN FLORA IN CHINA

重新定义后的中国斯蒂芬期植物群所对应的岩石地层单元只限于太原组下部晋祠段。该植物群以石松纲、楔叶纲、真蕨纲和种子蕨纲为主，也有一定数量的瓢叶纲和科达纲植物分子。尽管中国斯蒂芬期植物群与欧美同期植物群有一定共性，但二者差别仍很明显。

he Stephanian Flora of China,redefined biostratigraphically by the Fusulinid Triticites Zone (Jinci Member of the Taiyuan Formation ), contains 18 genera and 59 species, which belong to the Lycopsida, Sphenopsida,Noeggerathiopsida,Filicosida,Pteridospermopsida and Cordaitopsida respectively.The character of this flora can be showed as follow:1.The cyathea-type Pecopteris thrived,which resembled the Euramerican Strphanian Flora;2.The existence of Tingia,Conchiphyllum and some oriental-type Lepidodendron made the Chinese Stephanian Flora a typical endemic,so it should be a part of the Early Cathaysian Flora;3.Some significant elements of the Euramerican Stephanian Flora such as Odontopteris,Alethopteris,Callipteridium and Taeniopteris were completely absent or rare in China;4.TThe difference between the Stephanian Flora and the formerly so-called Stephanian Flora lies in that some index genera of the Middle Cathaysian Flora,for instance,Emplectopteris,Emplectopteridium and Lobatannularia had not appeared in Stephanian.