一、引言 1958年作者在湘西进行研究工作,收集了一些关于板溪群资料,发现了板溪群中的不整合面及复理石建造,这对江南古陆前震旦纪地层的分层及地质发展史的说明是具有一定意义的。 I. INTRODUCTION In 1958, the author carried out research work in western Hunan Province, collected some information about Banxi Group and found unconformities and flysch in Banxi Group, which stratified the pre-Sinian stratigraphy of the Jiangnan ancient land. The description of the history of geological development is of some significance.