摘要
辽东太子河流域是华北中石炭世地层典型发育地区,其地层学、古生物学研究已达到相当高的水平,并具备建阶条件,将中石炭世地层自下而上建立两个地方性阶:刘家哨阶和辽宁阶。刘家哨阶以Ovatia of.tenuistriata, Linoproductus tenuistriatus等腕足动物的消失为下限划分的生物标志,以Staffella subsolana,Profusulinella parva(类动物群的消失为上限划分的生物标志;辽宁阶下限层型即为刘家哨阶上限的界线层型,辽宁阶以Fusulina cylindrica-F.quasicylindrica类动物群的消失为上限划分的生物标志。刘家哨阶可与华南(黔南)罗苏阶和威宁阶下部Pseudostaffella时带、Profusulinella时带之和,与东殴Serpukhovian阶上部-Moscovian阶Verei层(组)、Kashir层下部之和大体相当;辽宁阶与华南威宁阶上部Fusulina-Fusulinella时带,与东殴Moscovian阶Kashir层上部,podol层,Mjachkov层之和大体相当。刘家哨阶在华北地层区东部分布广泛,辽宁阶除华北地层区南部部分地区外,其余地区都有分布。
The Taizihe Valley in eastern Liaoning is the typical area which strata of Mid-Carboniferous in North China developed well, and has been studied extensively and deeply in stratigraphy and palaeontology.Now we try to establish local stages of Mid-Carboniferous, upward is Liujiashao stage and Liaoning stage. The lower limit of Liujiashao stage is characterized by the disappearance of Bachiopods of Ovatia cf. tenuistriata Linoproductus tenuistriatus ect. and the upper limit by disappearance of Fusalinds of Eostaffella subsolana, Profusulinella parva the boundary-stratype of the lower limit of Liaoning stage is the upper limit boundary-strata type of Liujiashao stage.The upper limit of Liaoning stage is characterized by the disappearance of Fusulinds of Fusiilina cylindnca-F. quasicylindnca. Liujiashao stage, which is extensively present in the east of North China, is approximately equivalent to Pseudostaffella chronozone and Profusulinella chronozone of the lower part of Luosuan stage and Weiningian in South China (south Guizhou), and to the upper part o￡ Serpukhovian,Verei bed (Formation) of Moscovian and the lower Kashir bed in East Europe; Liaoning stage, which is present in North China siratigraphical area except the south part, is approximately equivalent to Fusulina-Fusidinella chronozone and the upper Weiningian in South China, and to the Podol bed and Mjachkov bed of upper Kashir bed of Moscovian in East Europe.
出处
《国土资源》
1990年第4期314-321,共8页
Land & Resources
关键词
华北地层区
刘家哨阶
辽宁阶
时带
Stratigraphical area in North China Liujiashao stage
Liaoning stage Chronozone
