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《Acta Sedimentologica Sinica》 2004-01
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Characteristics and Significance of Ecostratigraphy of Guanwushan Formation in the Middle Part of Longmen Mountains

ZHAO Bing WANG Jian po (College of Earth Science, Chengdu University of Science and Technology, Chengdu 610059)  
The lithological associations, basic sequences and sedimentary environments are discussed in this paper. Five palaeocommunities in Guanwushan Formation are recognized according to fundamentals and working methods of ecostratigraphy.They are Amboglossa Emanuella community (A-E), Septascolipora Frachastrata community (S-F), Variatrypa Ypsilorhynchus community (V-Y), Stringocephalus community(S) and Zhonghuacoelia Leiorhynchus community (Z-L). The organisms, relative abundance, ecotype and time interval of each community are analysed, on the basis of which the ecostratigraphic framework of Guanwushan period has been establised. New viewpoint on the time interval of Ypsilorhynchus in Longmen Mountains has also been proposed for the first time. It can be seen that ecostratigraphy could improve the precision of stratigraphic classification and correlation and the stratigraphic value of fossils. And many new evidences on palaeoenvironments and evolution of sedimentary base could be acquried from ecostratigraphic study.
【CateGory Index】: P539
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