新疆西准噶尔中泥盆世呼吉尔斯特植物群的特征、时代、古环境以及古植物地理学意义

ON THE MID DEVONIAN HUJIERSITE FLORA FROM WEST JUNGGAR,XINJIANG,CHINA,ITS CHARACTERISTICS,AGE,PALAEOENVIRONMENT AND PALAEOPHYTOGEOGRAPHICAL SIGNIFICANCES

阐述呼吉尔斯特植物群的定义、分布、时代、组成和特点。呼吉尔斯特植物群主要代表我国北方区中泥盆世晚期的植物群,其具有全球广布型属种,也具有特化型植物。该植物群生物量巨大,发育小规模的森林,也形成了若干薄的煤层,成煤植物和森林冠层植物为石松类。结合该植物群化石埋藏学、沉积岩石学、煤岩学等研究,对呼吉尔斯特植物群的古环境以及古植物地理学意义进行探讨,提出:呼吉尔斯特组若干条保存有丰富植物化石和煤层的剖面,代表中泥盆世晚期区域性的陆相沉积环境,新疆西准噶尔在中泥盆世是重要的植物迁徙大陆桥。

The Hujiersite flora was proposed based on the plant assemblage from the Hujiersite Formation, West Junggar, Xinjiang,China and was dated as the late Mid Devonian（Givetian）based on dispersed spores. Megaplants in the Hujiersite flora include lycopsids：Haskinsia hastata,H.sagittata,Leclercqia cf.complexa,L.uncinata,Colpodexylon gracilentum,Hoxtolgaya robusta and Drepanophycus minor;zosterophylls：Serrulacaulis spineus and Serrulacaulis cf.furcatus;fern-like plants： Compsocradus givetianus;progymnosperms：Aneurophyton doui and Tetraxylopteris sp.,and incertae sedis plants Tsaia conica,Taeniocrada and Blasaria.The palynological assemblage in the flora is dominated by a single spore type,Cymbosporites cf.magnificus,whose parent plants are probably lycopsids,and megaspore Verrucisporites lui.