新疆早侏罗世植物群特征

本文根据新疆早侏罗世各组中所产的植物化石,提出了疆新早侏罗世植物群分属于毛羽叶—锥叶蕨植物群与锥叶蕨—拟刺葵植物群的过渡植物群和锥叶蕨—拟刺葵植物群.过渡植物群中苏铁类比较丰富.锥叶蕨—拟刺葵植物群以真蕨类和银杏类为主,真蕨类中锥叶蕨,托第蕨,枝脉蕨最为发育.两个植物群按照不同层位均可分出上下两个组合.本文还探讨了八道湾组时代,认为无疑属早侏罗世,塔里奇克组植物组合也应属早侏罗世(塔里奇克组的地质时代为T_(?)—J_1).早侏罗世早期新疆气侯曾一度炎热,向后转为湿暖潮湿.

CHARACTERISTICS OF EARLY JURA FLORA IN XINJIANG

In Xinjiang the plants of Early Jura are divided into two flora: Transition Flora of ptilophyllum-Coniopteris Flora and Coniopteris-phoenicopsis Flora: and Coniopteris-phoenicopsis Flora. The Transition Flora is abundent in Cycadopsida. The Coniopteris- phoenicopsis Flora is mainly Filices and Ginkgophytes. Coniopteris, Todites and Cladophlebis are the most developed in Filices. The two flora are the lasis for division of Lower and Upper asseblages. The Badaowan Formation is of Early Jura, The flora of Taliqike Formation is also of Early Jura. Calimate of Early Jura was for a time burning hot and then warm and damp.