A DIFFERENT OPINION ON THE GEOLOGICAL AGE OF THE LONGZHAOGOU AND JIXI GROUPS OF EASTERN HEILONGJIANG, CHINA
A DIFFERENT OPINION ON THE GEOLOGICAL AGE OF THE LONGZHAOGOU AND JIXI GROUPS OF EASTERN HEILONGJIANG, CHINA
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DOI：
10.1111/j.1755-6724.1992.mp5002008.x
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发表时间：
2009-05
影响因子：
3.3
通讯作者：
Sha Jingeng
中科院分区：
文献类型：
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作者：
Sha Jingeng
黑龙江东部龙爪沟组和鸡西组煤系的时代此前被认为是侏罗纪或以侏罗纪为主。但在龙爪沟群上云山组和鸡西群下城子河组中发现了中巴雷面-早白垩世双壳类(双壳)化石，龙爪沟群七虎林组产生了早白垩世双壳类和菊石化石。因此，这两个群的地质时代主要或全部为早白垩世。
The age of the Longzhaogou and Jixi Groups of coal measures in eastern Heilongjiang were previously considered to be Jurassic or mainly Jurassic. But there occur Middle Barremian- Early Albian Aucellina ( bivalvia) fossils in the Upper Yunshan Formation of the Longzhaogou Group and the Lower Chengzihe Formation of the Jixi Group, and the Qihulin Formation of the Longzhaogou Group yields Early Cretaceous bivalve and ammonite fossils. Consequently, the geological ages of the two groups are mainly, or even all, Early Cretaceous.