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本文是根据1975年,中国地质科学院地质昕究所原三室上古生代组和甘肃区测一队古生物组为编制全国地层表,在甘肃靖远地区工作中,共同采集的材料完成的。磁窑榆树梁石炭系剖面所产菊石经研究包括13个属(Paradimorphoceras,Clyphiolobus,Me- (dimorphoceras,Cluthoceras,Eumorphoceras,Kazakhoceras,Anthracoceras,Cravenoceras,Bilin- guites,Phillipsoceras,Proshumardites,Gastrioceras,Branneroceras)28个种,其中新种7个。主要集中在三个层位,可以分成三个组合。一、下部 Gasirioceras-Branneroceras 组合,大致和西北欧纳缪尔期的 G 带相当。二、中部 Bilinguites-Phyllipsoceras 组合,面貌和乌拉尔地区的相近,和西北欧纳缪尔期的 R 带相当。三、上部 Eumorphoceras-Cravenoceras 组合,和西北欧纳缪期的 E 带相当。榆树梁剖面中未见 H 带的分子。本文相当 E 带的地层叫榆树梁组,相当 R 带的地层叫靖远组, 相当 G 带的地层叫羊虎沟组。下、上石炭统的界线在榆树梁组和靖远组之间。
This article is based on 1975, the Chinese Academy of Geological Sciences Institute of the original three rooms of the Paleozoic and Gansu Paleozoic paleontology group for the preparation of the national stratigraphic table, in Gansu Jingyuan area work, the common acquisition of the material completed. Caves of the Elm Shumong Carboniferous section of the cinder include 13 species (Paradimorphoceras, Clyphiolobus, Me- (dimorphoceras, Cluthoceras, Eumorphoceras, Kazakhoceras, Anthracoceras, Cravenoceras, Bilin- guites, Phillipsoceras, Proshumardites, Gastrioceras, Branneroceras) Species, of which seven new species, mainly concentrated in three layers, can be divided into three combinations.A, the lower Gasirioceras-Branneroceras assemblage, roughly andNorthwestern EuropeNamuoye periodG belt.Second, the central Bilinguites-Phyllipsoceras The assemblage, similar in appearance to the Ural region, is comparable to the R zone in the Nauwauerian period of the northwestern Europe.3 The upper Eumorphoceras-Cravenoceras assemblage is comparable to the E band in the Namurian period of the northwestern Europe In this paper, the formation of the equivalent E zone is called Yushuliang Formation, and the formation of equivalent R zone is called Jingyuan Formation, and the formation of equivalent G belt is called Yanghuogou Formation, and the upper Carboniferous boundary between Yushuliang Formation and Jingyuan Formation .