| 陕西岐山产Eumorphotis的“石千峰组”地层问题 |
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| 引用本文： | 程政武
,曲立范
,侯静鹏
,李佩贤.陕西岐山产Eumorphotis的“石千峰组”地层问题[J].地层学杂志,1983(3). |
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| 作者姓名： | 程政武 曲立范 侯静鹏 李佩贤 |
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| 摘 要： | <正> “石千峰群”的问题,是涉及华北及其相邻广大地区陆相二—三叠系划分、对比及界线的重大地层课题,自下而上分为石千峰组(孙家沟组)、刘家沟组、和尚沟组。并确认石千峰组含有晚二叠世的Lueckisporites-Protohaploxypinus 孢粉组合;Abiella sp., Microdontella sp.等瓣鳃类;Sinolimnadiopsis yaoxianensis, Huanghestheria longellipsa等叶肢介;Shihtienfenia permica, Shansisaurus xuecunensis, Tapinocephalidae等脊椎动物化石。刘家沟组含早三叠
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Problems of Eumorphotes-bearing strata of the"Shihchienfeng Formation" in Qish-an, Shaanxi |
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| Abstract: | The "Liujiagou Formation", being in fault-contact with the underlying Shihchienfeng Formation, is lithologically identical to the " Shihchienfeng Formation" in Houzhougong-miao and contains also the Lundbladispora-Taeniaesportes-Cycadopites assemblage and marine bivalve Pteria cf. murchisoni of Early Triassic Olenekian age. Hence the Eumorphotis-bearing "Shihehienfeng Formation" is not equivalent to the true Shihchienfeng Formation; it should rather belong to the "Liujiagou Formation" in Zishiya except that it represents a facies (littoral to nexitie) different from that represented by the latter. Here the name, the Qishan Formation proposed by the Third Exploration Brigade (1975) was used. The two bivalve horizons mentioned above show that the Liujiagou Formation is largely equivalent to the Induan-Lower Olenekian. This supports the conclusion drawn from the study of terrestrial fossils in North China, i. e. the Shihchienfeng Formation belongs to the Upper Permian, while the Liujiagou and Heshanggou Formations to the Lower Triassic. |
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