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在溧水中南部云合山一带的火山岩系中夹有一套火山碎屑沉积岩。1960年江苏区调队命名为云台山组。以后,一些学者认为云合山组缺乏独立存在的依据,因而出现了三种不同的意见:①取消云合山组,认为它只是火山岩系中的夹层,这种夹层是不能作为独立地层单位的;②建立和使用云合山组,这对苏南地区早白垩世~*火山岩系的划分和对比具有积极作用;③将云合山组肢解,其下部属于龙王山组下段及上段,其上部属大王山组之上。近几年来,笔者在溧水地区做地层地球化学研究工作,获得了云合山组等地层微量元素地球化学数据。多元统计分析结果表明,云合山组可以作为独立地层单位,且层位介于龙王山组之上,大王山组之下。
A volcanic clastic sedimentary rock is sandwiched between volcanic rocks in the Yungui Mountain area in central-southern Lishui. In 1960 Jiangsu Province transfer team named Yuntaishan group. Later, some scholars think that the Yunheshan Formation lacked the basis of independent existence, and thus three different opinions emerged: (1) The Yunshishan Formation was canceled and considered to be only a mezzanine in the volcanic series. Such intercalations can not be regarded as independent strata ; ②The establishment and use of the Yun-He-Shan Formation has a positive effect on the division and comparison of the Early Cretaceous ~ * volcanic rock series in the southern Jiangsu area; ③ The Yun-He-Shan Formation is dismembered and the lower part belongs to the lower and upper reaches of the Longwangshan Formation, Subordinate King Hill group above. In recent years, the author made stratigraphic geochemistry research work in Lishui area, and obtained the trace element geochemical data of the strata such as the Yunhuishan Formation. The results of multivariate statistical analysis show that the Yunheshan Formation can be regarded as an independent strata unit, and the horizon is above the Longwangshan Formation and under the Dawangshan Formation.