摘要
近年来的研究资料证明,在Misellina claudiae带之下马平组灰岩(船山组)上部,产二叠纪的(竹蜓)类、珊瑚和腕足类,其时代相当于阿舍利阶(Asselian)上部至萨克马尔阶(Sakmarian)和阿丁斯克阶(Artinaskian)的一部分。湖南嘉禾袁家剖面,船山组灰岩上部盛产该期代表分子Mccloudia,许寿永等称Mccioudia带,并以该带的底,视作石炭一二叠系的分界。据此,笔者将嘉禾袁家剖面二叠系的底界,下移到船山组灰岩第六层产Mccloudia带的底。该剖面的船山组灰岩为跨时的岩石地层单位。石炭一二叠系为连续沉积。本文还讨论该剖面与邻区的对比及其古地理环境。
Recent studies indicate that the upper part of the Maping(or Chuanshan) Formation limestone, overlai(?)d by the Micellina claudiae Zone, yields Permian Fusulinides, Corals and Brachiopods, its age corresponding to the upper part of the Asselian,the Sakmarian and a part of the Artinskian. The upper part of Chuanshan Formation in Yuanjia section of Jiahe county, containing abundant Mccloudia. is named as Mccloudia Zone. of which the bottom is chosen to be the boundary between Carboniferous and Permian Systems by Xu Shouyong et al. Accordingly, the lower limit of the Permian System in Yuanjia section, Jiahe county should be placed at the bottom of the sixth bed, corresponding to the lower limit of the Mccloudia Zone. The Chuanshan Formation in this section is a diachronous lithostratigraphic unit. The Carboniferous System to Permian System is successive sedimentation. The biostratigraphical correlation and paleogeographical environment of the Longlinian age in southern China is also discussed in this paper.
出处
《湖南地质》
1990年第3期69-74,共6页
Hunan Geology
关键词
石炭纪
二叠纪
地层界线
Carboniferous-Permian System
Stratigraphic boundary
Mccloudia
Jiahe County
