摘要:
茅山群分布于苏、浙、皖三省接壤地区,对其时代归属问题。长期以来存在很大争论。在前人工作基础上进一步广泛调查研究之后,作者认为:茅山群与上、下地层并非“假整合”,它与上覆上泥盆统五通组及下伏中志留统坟头组均为整合过渡关系。其次茅山群下、中部已采获丰富的鱼类化石Sinogaiaspis sp.,Sinacanthus sp., Antiarchi sp.,XiuShuiaspis sp.等,从目前国内、外对鱼类化石研究资料来看,泥盆纪是鱼类最繁盛的时期,而志留纪及更老地层中鱼类化石是很稀少的。因此,茅山群时代厘定为晚志留世—中泥盆世较为妥当。
Abstract:
The Maoshan Group is distributed on the Jiangsu-Zhejiang—Anhui border region. Its age assignment has long been a subject of controversy. After further detailed investigations based on the previous work, the author holds that the contact relationships between the Maoshan Group and the overlying Upper Devonian Wutong Formation and underlying Middle Silurian Wentou Formation are not "disconformable" but rather conformable. Besides, the lower and middle parts of the Maoshan Group contain abundant fish fossils such Sinogaie sp., Siancanthus sp., Anticachi sp. and Xiushuiaspis sp. From the existing data of fish fossils both at home and abroad, the Devonian was a period of flourishing of fishes, while fish fossils are rare in Silurian and still older strata. Therefore, it is advisable to assign the age of the Maoshan Group to Late Silurian-Middle Devonian.
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