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大陆冰川活动涉及广大地区、甚至全球。它所形成的各种地层,具有重要的地层学价值。震旦纪冰川活动在桂北境内形成了较为广泛的长安组、富禄组、“南沱组”冰川海洋相与间冰期沉积。现以中部的三江县九山(?)、东坡岭两剖面为代表,将其岩性组合等从老到新叙述如下: 长安组(Z_(2c))按岩性分为四段。第一段(Z_(2c~1))主要由含少量细砾石的长英砂岩、长石砂岩夹少量板岩组成。与下伏地层丹洲群拱洞组顶部的板岩呈整合接触(图1),砂岩为
The glacier activities in the mainland involve vast areas and even the whole world. Various formations formed by it have important stratigraphic value. The Sinian glacier formed a relatively wide range of Chang’an Formation, Fulu Formation, and “Nantuo Formation” glacial oceanic facies and interglacial deposition in northern Guangxi. Now represented by the Jiushan (?) And Dongpoling profiles in Sanjiang County of the central region, the lithologic assemblages are described as follows from old to new: The Chang’an Formation (Z_ (2c)) is divided into four sections by lithology. The first section (Z_ (2c ~ 1)) is mainly composed of a small amount of fine gravel of the long sandstone, feldspar sandstone sandwiches. It is in integrated contact with the slate at the top of the archipelago of the Danzhou Group in the underlying strata (Figure 1)