丙南组的新认识

摘要

The authors discussed in detail the characte ristics of the roc k assemblage and inferred paleoenvironment of the deposited Bingnan Formatio n by stu dying the outcrop and typical section of the Bingnan Formation in Panxi area . They advances a new viewpoint for the first time that the paleoenvironment of the deposited Bingnan Formation is a mari ne sedime ntary environment in partial region. Before now, many scholars used to refer tenta tively the age of Bingnan Formation to Late Trassic Epoch because of no fossils . Now, the age of the Bingnan Formation is first assigned to Early Trassian on the basis of its paleoclimatical data, its correlation with the conterminous Qingtian bao Formation(T1), and its contact with the overlying Daqiaodi Formation(T3).%通过攀西地区丙南组露头及典型剖面研究 ，详细论述了丙南组的岩性组合特征及分段，首次提出丙南组在部分地区为海相沉积的新观 点。 丙南组的时代自曾繁礻　乃先生1945年于 攀枝花丙南渡命 名至今，皆因未发现化石而暂置晚三叠世。通过野 外实 地调查及相关资料研究，以古气候因素、与邻区早三叠世青天堡组对比,以及丙南组与上覆 大荞地组的接触关系等多方面资料，提出丙南组的时代归属应为早三叠世。