内蒙古中部金盆地区发现与冀北大店子组相当的地层
Discovery of equivalent stratum to Dadianzi Formation of northern Hebei in the Jinpen area, Inner Mongolia, China.
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摘要: 开展金盆地区1∶5万区域地质调查时，在内蒙古乌兰察布盟卓资县三道营乡黑山西坡老虎沟大青山组中首次发现了早白垩世化石：介形虫Cypridea ex gr. liaoningensis，Luanpingella sp.，Djungarica camarata，Clinocypris scolia，Rhinocypris echinta，Lycopterocypris infantilis，Darwinula contracta；叶肢介Neimongolestheria? sp.及瓣鳃类Ferganoconcha quadrata，F. jorekensis等。这套含化石的湖相地层的岩石特征、化石特征均与大青山组标准剖面不同，而与冀北大店子组的岩性组合、古生物特征均可对比。按照岩石地层单位的划分原则，这套含早白垩世化石的湖相地层不属于大青山组，应从大青山组中划分出来，代表阴山地区早白垩世早期的湖相沉积地层。金盆地区存在冀北滦平盆地的大店子组层位。Abstract: During 1∶50000 scale regional geological survey carried out in Jinpen area, Early Cretaceous fossils were discovered in Inner Mongolia for the first time which distribut in Daqingshan Formation, Laohugou, west slope of Heishan, Sandaoying Town, Zuozi County, Ulanqab. Fossils include Cypridea ex gr. liaoningensis，Luanpingella sp.，Djungarica camarata，Clinocypris scolia，Rhinocypris echinta，Lycopterocypris infantilis，Darwinula contracta； Neimongolestheria? sp. Ferganoconcha quadrata and F. jorekensis etc. The lithology and fossil haracteristics of this lake facies stratum are different from that of the standard Daqingshan geological section; however it is comparable with Dadianzi Formation in northern Heibei. We believed that this new set of stratum should be separated from Daqingshan Formation, because it represents the Early Cretaceous lake facies stratum of Yinshan area. There is also Dadianzi Formation strata in Jinpen area which mainly developed in Luanping basin, northern Heibei.
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Key words:
- Dadianzi Formation /
- Daqingshan Formation /
- Jinpen area /
- Inner Mongolia
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