中国北方安加拉植物群

中国北方发育的安加拉植物群是我国晚古生代植物区系的重要组成部分，主要分布于边疆省区，自石炭纪至二叠纪均有发育。安加拉植物群与其相关的华夏植物群在早二叠世及以前，在各自分布区平行发展，仅在晚二叠世出现少数植物分子相互迁移至对方地区形成混生现象，这与地质构造发展关系密切。

The Angara Flora from Northern China

Angara flora is an important part of Carboniferous and Permian fossil plants in northern China and has been found mainly in the border provinces and regions of northern China with a roughly E_W extension.Its geographic range includes northern Xinjiang, northern Gansu, northern Ningxia, the Beishan and Badain Jaran areas in west and the Abga Qi, Dong Ujimqin Qi areas in east of Nei Mongol plateu,to east the Da Xingan Ling and Xiao Xingan Ling ranges,and the Zhangguangcai Ling, Wandashan and Laoyieling ranges of Changbaishan Mountains. So far as the knowledge goes, the south limit of the distribution of Angara folra in China is roughly a line from the Telasi river in west to Xingxingxia in east of Xinjiang, eastward through Alxa, Yinshan, Onder Sum, Xar Moron river of Nei Mongol to Songhuahu lake and Yanji city of Jilin,and some late Permian elements of Angara flora have been found in farther south.In geological age,Angara flora in China is ranging from Early Carboniferous to Late Permian as in Angaraland.The Early and Middle Carboniferous ones are mainly distributed in northern Xinjiang, where the Early_Middle Carboniferous strata are widespread with compex sedimental enviromment of marine, continantal and paralic facies, and yielding abundant animal and plant fossils. The Late Carboniferous ones are widespread over the region in thewest, middle and east parts, where there is a large area terrestrial strata.The Early Permian fossil plants ane poor, though they have been found in the west and east parts of the region, with collections of notmany individuals and relatively monotonous taxa. In Late Permian, Angara flora is most flourishing in this region and occurring almost everywhere in this region.