A Jurassic Flora from the Yan'an Formation in Dongsheng Coal Field,Inner Mongolia
A Jurassic Flora from the Yan'an Formation in Dongsheng Coal Field,Inner Mongolia
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发表时间：
2011
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通讯作者：
Du Jianwei
中科院分区：
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作者：
Du Jianwei
为了确定内蒙古东胜煤田延安组的地质时代，对该区钻探发现的绝大多数植物化石进行了详细的研究和鉴定。植物群由Arthropsida、Filices、Pteridospermae、Cycadopsida、Ginkdopsida、Coniferopsida.Filices属25属68种组成。银杏属是该区植物群的重要组成部分。其次是苏铁类和松果类。节肢动物和蕨类较少。建立了孔雀形目-枝叶蕨属组合。该组合可划分为延安组一段孔雀亚组和延安组二段枝叶亚组。通过与国内外其他地区植物群的对比，该组合可分为两个亚组：延安组一段孔雀亚组和延安组二段孔雀亚组延安组时代第一段为早侏罗世晚期的托尔西期，延安组时代的第二段为中侏罗世早期的阿勒尼期至巴约期。
In order to determine the geological age of Yan'an formation in Dongsheng coalfield Inner Mongolia,the great majority of plant fossils from drills in this area were studied and identified in detail.The flora consisted of 25 genuses 68 species belong to Arthropsida、Filices、Pteridospermae、Cycadopsida、Ginkdopsida、Coniferopsida.Filices as well as Ginkdopsida appeared to be the important component of the flora.Cycadopsida and Coniferopsida rank next in importance.Arthropsida and Pteridospermae were scarce.Coniopteris—Cladophlebis assemblage was set up.This assemblage was divided into two subassemblage:Coniopteris—Neocalamites subassemblage in the first member of Yan'an formation and Cladophlebis—Phoenicopsis subassemblage in the second member of Yan'an formation.Through correlation with the flora of other areas home and abroad,the first member of Yan'an formation's age was Toarcian of the late Early Jurassic,and the second member of Yan'an formation's age was Aalenian to Bajocian of the early Middle Jurassic.