| 川陕边境广元宁强间的志留系 |
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| 引用本文： | 陈旭,戎嘉余.川陕边境广元宁强间的志留系[J].地层学杂志,1991,15(1):1-25. |
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| 作者姓名： | 陈旭 戎嘉余 |
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| 摘 要： | <正> 李希霍芬(Richthofen 1882)将宁强牢固关、黄坝驿、茅坪沟、广元校场坝、神宣驿(即宣河)和朝天驿(即朝天镇)之间的地层分为8层。珊瑚化石(i层)经Lindstrom鉴定为 Favosites forbesi,Halysites calenularius,Heliolites,Caythophyllum,Amplexus和Alveolites;腕足类经Kayser鉴定为Orthis类(h层),Orthis calligramma 和Spirifer(1层)。葛利普(1924)把宁强广元间的志留系分为朝天组(Chaotien Formation),浅水
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| 关 键 词： | 志留纪 宁强组 广元 地层 |
The Silurian rocks between Guangyuan of Sichuan and Ningqiang of Shaanxi |
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| Abstract: | The youngest Llandovery marine 'Strata were measured by the authors along the Guang-yuan-Ningqiang highway during their field excursion in 1987.A new member, the Shen-xuanyi Member of the Ningqiang Formation is proposed to represent the latest Telychian carbonate deposits with bioherms, biostromes, and the marine red beds.The top of the Shenxuanyi Member is near the top of the Llandovery and is considered to be a little higher than the top of the Huixingshao Formation which was recognized as the highest beds of Llandovery strata in most areas of the Yangtze Region.The Telychian rocks older than this member are also redefined based on the continuous sections within this area.All the Telychian rocks in this area are recognized in descending order as follows: Ningqiang FormationShenxuanyi Member, Carbonate rocks with bioherms, biostromes, and marine red beds, corresponding to the spiral-is-grandis Zone, the latest zone of Telychian.Yangpowan Member, Shales with a few carbonate rocks and marine red beds, corresponding to the upper part of griestoniensis Zone.Wangjiawan Formation, Shales and siltstones with marine red beds, correspoding to the crispus Zone and the lower part of the griestoniensis Zone.Cuijiagou Formation, Graptolite shales and siltstones, correspoding to the turriculutus Zone.The correlation and range charts are demonstrated in the Chinese text. |
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