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广西象州大乐地区的泥盆纪地层是华南象州型泥盆系的标准序列之一,其中以下泥盆统上部的大乐组和中泥盆统应堂组发育较好。1974年华南泥盆系会议之后,大乐剖面被确定为华南泥盆系下、中统的界线层型及四排阶、应堂阶的层型剖面。本文所记述的层型剖面上的大乐组、应堂组和东岗岭组下部的床板珊瑚为我队李洪锐等(1973、1974)所采集,笔者(1974)曾作了系统补采。共确定了26属57种,限于篇幅,本文只描述其中的36个种(包括24个新种),未描述的已知种仅用于生物地层方面的论述。
The Devonian strata in the Da-Le area of Guangxi Zhuang Autonomous Region is one of the standard sequences of the Xiangzhou-type Devonian in southern China. Among them, the Dayale Formation and the Middle Devonian Yingtang Formation in the upper Devonian developed well. After the South China Devonian Conference in 1974, the Da Le section was identified as the stratigraphic boundary line of the Lower and Middle Ordovician systems in southern China and the stratigraphic profile of the fourth-order and the Ying-Tang order. The stratigraphic cohesions in Dayeling, Yingtingtang and Donggangling formations described in this paper were collected by Li Hongrui et al. (1973, 1974) of our team. The author (1974) made a systematic reclamation. A total of 57 genera of 26 genera were identified. Due to space limitations, only 36 species (including 24 new ones) were described in this article, and only some of the known species that were not described were only used in the discussion of biostratigraphy.