摘要
辽东半岛南部寒武系葛屯组发现蠕虫和小壳化石,为寒武系底部序列(国际上统称为纽芬兰统)。在拉树山寒武系与奥陶系交界处有2个笔石带,下为Dictyonema kelanense延限带,上为Airograptus furciferus—Staurograptus组合带,相当林尧坤(1980)的中国寒武纪笔石和笔石序列的Dendrograptus erectus minor带(层),其中有Dictyonema kelanense,该序列为寒武系顶部序列(国际上统称芙蓉统上部)。"辽宁省岩石地层(1997)"出版以来,沿用"馒头组",从下而上划分为大后海段、石桥段、当十段,岩性明显三分。1907年Willis和Blackwelder初建馒头组时仅根据山东馒头山处地层,笼统的统称为馒头组页岩,笔者建议岩石地层大馒头组应该解体,恢复沿用馒头组、毛庄组、徐庄组。
The worms and small shell fossils have been found in the Cambrian Getun Formation of Southern Liaodong Peninsula, which stand for the roof sequence of the Cambrian system （collectively referred to as Newfoundland Series）.Two graptolite zones are existed at the border of Cambrian and Ordovician, the lower one is Dictyonema kelanense range zone, while the upper one is Airograptus furciferus Staurograptus assemblage zone, which are similar to the Chinese Cambrian graptolite and the Dendrograptus erectus minor belt （layers） in graptolite sequence referred by Lin Yaokun （1980）, including the Dictyonema kelanense. And these two graptolite zones serve as the floor sequence of the Cambrian system （generally referred to as the upper part of Furongian Series）. Since the book of“Rock Formation in Liaoning Province （1997）”was released, the term of “Mantou Formation” was continued to be use, which has been divided into Dahouhai, Shiqiao and Dangshi sections from floor to roof, with three distinctly lithology. In early 1907, Willis and Blackwelder named the strata of Mantou Mountain in Shandong Province as the shale of Mantou Formation when they proposed the term of “Mantou Formation”. Thus, this article suggests that the lithostratigraphic unit of Damantou Formation should be replaced by the Mantou Formation, Maozhuang Formation and Xuzhuang Formation.
出处
《西北地质》
CAS
CSCD
2017年第4期128-139,共12页
Northwestern Geology
基金
中国地质调查局辽宁省区域地质志项目(1212010811028)
关键词
辽东半岛南部
寒武系顶底界
馒头组
岩石地层单位
生物地层单位
Southern Liaodong Peninsula
roof and floorboundary of Cambrian system
Mantou Formation
lithostratigraphic unit
biostratigraphic units
