1 中国科学院地质与地球物理研究所，北京 100029 2 中国科学院南京地质古生物研究所，江苏南京 210008 3 美国弗吉尼亚州立诺福克大学，美国诺福克 VA 23504
Palynoflora and its environmental significance of the Early Cretaceous in Baicheng，Xinjiang Autonomous Region
Jiang Dexin1, Wang Yongdong2, Wei Jiang3
1 Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029 2 Nanjing Institute of Geology and Paleontology，Chinese Academy of Sciences，Nanjing 210008，Jiangsu 3 Norfolk State University，Norfolk VA 23504，USA
Abstract：Based on the investigation of 48 species of spores and pollen belonging to 29 genera found in the Lower Cretaceous Shushanhe Formation in the Baicheng district of the Xinjiang Autonomous Region，the early Early Cretaceous palynoflora in the area has been established. The palynoflora of the Shushanhe Formation is characterized by the dominance of Cheirolepidiaceae of Coniferales and the influence of Lygodiaceae of Filicales. In accordance with the characters of the palynoflora，the early Early Cretaceous palaeoecological，palaeoclimatic and palaeogeographic characters have been discussed. Because the Cheirolepidiaceous plants were drought resistant and thermophilic trees and shrubs，and both the Cheirolepidiaceae and Lygodiaceae were most common in subtropical climates in that period，the palynoflora indicated a dry and rather hot climate. Judging from the palynological data，the early Early Cretaceous palaeoclimate in the Baicheng district should belong to the arid type of subtropical zone. The biodiversity of the palynoflora and the obvious zonality of the plant geographic distribution show that the early Early Cretaceous palaeogeography in the area should possess complex and various landscapes，including multi-peaked mountains，mountain valleys，mountain streams，river delta marsh and marsh wetland etc.
Jiang Dexin,Wang Yongdong,Wei Jiang. Palynoflora and its environmental significance of the Early Cretaceous in Baicheng，Xinjiang Autonomous Region[J]. JOPC, 2008, 10(1): 77-86.
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