Full
WANG Yi,born in 1963,is a professor of Nanjing Institute of Geology and Palaeontology,CAS. His research focuses on Silurian-Devonian System,and early land plants. E-mail: yiwang@nigpas.ac.cn.
Outline
The Qujing and surrounding areas,Yunnan,China,is one of the earliest and more in-depth research areas of the Middle Devonian in China,and one of the ideal areas for study on the distribution of land and shallow sea in the late Middle Devonian period. According to the lithologic characteristics and the contact relationship with the underlying strata,this paper sorts out the late Middle Devonian strata in the area is better to use the Xichong Formation/Qujing Formation than the Haikou Formation. The Xichong Formation is redetermined,and its age is determined to be the late Middle Devonian(Givetian). The Middle Devonian sequence in the area,from bottom to top,consists of Chongdong,Shangshuanghe and Xichong formations or Qujing Formation(coeval but heterotrophic). Based on the lithology,contact relationship with the underlying strata and sedimentary thickness,the upper Middle Devonian in the area is divided into three distribution zones: clastic rocks,carbonate and clastic rocks mixed,and carbonates distribution areas,among which the clastic rock distribution area is divided into two subzones. Based on paleontological evidence,sedimentary characteristics and preliminary geochemical results,the characteristics of the Xichong Formation were analyzed,and it was proposed that the formation was mainly terrestrial sedimentary and developed land-sea transitional facies sedimentation. The Qujing Formation of the same period is a normal shallow marine sediment. In the late Middle Devonian,from west to east,the area showed a transition from erosional land zone to terrestrial depositional zone to interaction zone of land and shallow sea,and finally to the normal shallow sea. This land-shallow sea change is not only controlled by the palaeogeographic distribution of the region,but also by the macroscopic influence of the Caledonian tectonic movements.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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