Middle Jurassic Palynoflora and Its Environmental Significance of Dongsheng,Inner Mongolia

JIANG De-xin; WANG Yong-dong

Based on the investigations of 63 species of fossil spores and pollen referred to 34 genera found from the Middle Jurassic Yanan Formation in Dongsheng region of Inner Mongolia, the early Middle Jurassic palynoflora in the region was established in this paper. According to the character of the palynoflora, the early Middle Jurassic paleoecological characteristics, paleoclimatic conditions and sedimentary environment in the study area are discussed. An approach to the original environment of coal, oil and natural gas is also made. The results of this study indicate that the warm and humid climate might be favorable for the origin of coal, oil and natural gas, and the lacustrine-marsh (or swamp) deposits under warm or hot and humid or wet climatic conditions might possess tremendous potentials for the origin of coal, oil and natural gas

1 Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000;

2 Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008

Received Date: 2001-02-23

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Abstract: Based on the investigations of 63 species of fossil spores and pollen referred to 34 genera found from the Middle Jurassic Yanan Formation in Dongsheng region of Inner Mongolia, the early Middle Jurassic palynoflora in the region was established in this paper. According to the character of the palynoflora, the early Middle Jurassic paleoecological characteristics, paleoclimatic conditions and sedimentary environment in the study area are discussed. An approach to the original environment of coal, oil and natural gas is also made. The results of this study indicate that the warm and humid climate might be favorable for the origin of coal, oil and natural gas, and the lacustrine-marsh (or swamp) deposits under warm or hot and humid or wet climatic conditions might possess tremendous potentials for the origin of coal, oil and natural gas

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Middle Jurassic Palynoflora and Its Environmental Significance of Dongsheng,Inner Mongolia

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