| 新化,湘潭等地跳马涧组的遗迹化石 |
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| 引用本文： | 张欣平.新化,湘潭等地跳马涧组的遗迹化石[J].湖南地质,1991,10(2):97-104,T002. |
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| 作者姓名： | 张欣平 |
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| 作者单位： | 湖南省地质矿产局区调所 湘潭411000 |
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| 摘 要： | 新化、湘潭等地跳马涧组的遗迹化石经笔者鉴定与描术者共15个遗迹属24个遗迹种(包括4个新遗迹种)。它们大部分属于跳马涧组上部,可分为Arenicolites-Palaeophycus组合,Skolithos-Planolites组合,Palaeophycus-Gordia组合,Rhizocorallium-Planolites组合,代表近滨环境,属Cruziana遗迹相。部分属于顶部Zoophycus-Cochlichnus组合和Zoophycus-Skolithos组合,属Zoophycus遗迹相上部。综合前人资料,湖南跳马涧组遗迹化石现已发现22属45种,可归并为居住迹、觅食迹、爬行迹、休息迹、啮食迹、钻孔、逃逸构造、生物扰动构造八种生态类型。由跳马涧组下部至顶部,由以居住迹为主的遗迹组合,转变为居住迹、觅食迹同等发育或以觅食迹为主,转变为啮食迹为主的组合。反映由前滨转变为近滨,再转变为远滨,代表海水加深、海侵扩大的过程。
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| 关 键 词： | 遗迹化石 古生物 中泥盆世 |
TRACE FOSSILS FROM TIAOMAJIAN FORMATION OF MIDDLE DEVONIAN IN XINHUA,XIANTAN AND OTHER AREAS |
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| Zhang Xinping.TRACE FOSSILS FROM TIAOMAJIAN FORMATION OF MIDDLE DEVONIAN IN XINHUA,XIANTAN AND OTHER AREAS[J].Hunan Geology,1991,10(2):97-104,T002. |
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| Authors: | Zhang Xinping |
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| Institution: | Regional Geologic Survey Institute of Hunan Bureau of Geology and Mineral Resources |
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| Abstract: | The trace fossils from Tiaomajian Formation of Middle Devonian in Xinhua, Xiantan and other areas have been determined and described by the author, which refer to 15 ichnogenera, 21 ichnospecies(4 of them are new ichnospecies). Most of them are included in Arenicolites-Palaeophycus assemblage, Skolithos-Planolites assemblage, Palaeophycus-Gordia assemblage, Rhizocorallium-Planolites assemblage,representing a near-shore environment, belonging to Cruziana ichnofacies of upper Tiaomajian Formation. Part of them can be included in Zoophycus-Cochlichnus assemblage, Zoophycus-Skolithos assemblage, representing an offshore environment, belonging to Zoophycus ichnofacies, occurred in the upmost part of Tiaomajian Formation. Former data are synthesized, which indicates that the ichnofossils from Tiaomajian Formation in Hunan are refered to 22 ichnogenera, 40 ichnospecies,and can be grouped into 8 ecological types: domichnia, fodinichnia, repichnia, cubichnia, pascichnia, borings escape trace, bioturbation structures. From lower part to upmost part of Tiaomajian Formation, the ichnofossil assemblage changed from domichnia-dominated ones to those that both domichnia and fodinichnia developped on equal basis, or from fodinichniadomina ted ones to pascichnia-dominated ones, which indicates that the sedimentary environment changed from foreshore to nearshore, and then to offshore, representing a seawater-deepening and transgression-extending process. |
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| Keywords: | Extict organisms Ichnofossils Sedimentary environment Middle Devonian |
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