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长江峡区震旦系剖面是李四光教授于1924年建立的,自下而上划分为南沱组(包括南沱砂岩及南沱冰碛层)、陡山沱组和灯影组三个岩组,以南沱砂岩与其下变质地层的不整合面为其底界。1924年以来,此种意见广为沿用。1963年刘鸿允先生将南沱组两个段上升为组,分别称莲沱组(原砂岩段)和南沱组(原冰碛层),上下统的界线移至冰碛层底部,仍以莲沱组底面为震旦系下界。然而,自1965年江西省区测队提出莲沱组之下,尚存在一个地层单位——落可(山东)组并归属震旦
The Sinian section of the Changjiang Gap area was established by Professor Li Siguang in 1924 and is divided into three groups of rock formations: Nantuo Formation (including Nantuo sandstone and Nantuo moraine layer), Doushantuo Formation and Deng Ying Formation from bottom to top, The unconformity of Nantuo sandstone and its sub-metamorphic strata is the bottom boundary. Since 1924, this kind of opinion has been widely used. In 1963, Mr. Liu Hongyun raised the two sections of the Nantuo Formation into groups, respectively called the Liantuo Formation (original sandstone section) and the Nantuo Formation (the original moraine layer), and moved the boundary between the upper and lower systems to the bottom of the moraine layer. The bottom of Tuo Formation is Sinian lower bound. However, since the team from Jiangxi Province in 1965 proposed that there should be a stratigraphic unit, Lok Ke (Shandong), belonging to the Sinian