中文摘要：

广西象州县大乐乡泥盆系剖面是华南象州型（底栖相）泥盆系的标准剖面（侯鸿飞、王士涛，1988），其下部大瑶山群为一套厚达上千米的石英砂岩夹粉砂岩沉积，底部以一层约2m厚的砾岩与下伏的前泥盆系呈角度不整合接触（白顺良等，1982）。大瑶山群岩性单一，化石稀少且保存不佳，生物地层学研究程度较低。根据沉积特征和区域地质对比，白顺良等（1982）和侯鸿飞、王士涛（1988）认为，大瑶山群的沉积时代大致与广西六景地区莲花山组和那高岭组的时代相当，为早泥盆世洛霍考夫期。

英文摘要：

A new galeaspid agnathan, Diploholcaspis daleensis gen. et sp. nov., was collected from the middle part of the Dayaoshan Group of Dale, Xiangzhou County, Guangxi, China. The Dayaoshan Group is more than one thousand meters in thickness, but yields rare fossils. It is unconformable with pre-Devonian deposits whose 1982）. Based on the depositional sequence and age is likely to be the Cambrian （Bai et al., the age of the overlying strata, the Dayaoshan Group was referred to the Lochkovian （Early Devonian） in age （Bai et al., 1982; Hou and Wang, 1988 ）. Diploholcaspis daleensis represents the first finding of early vertebrates in the Dayaoshan Group, and provides new data for the regional stratigraphic correlation of Guangxi.