贵州三都地区阿伦尼克期疑源类的发现及其意义

本文首报报道了发现贵州三都地区同高组下段的疑源类化石，属种丰富，保存完好，它们多见于阿伦尼克期至兰维尔期，其中有些分子仅限一阿伦尼克期，根据组合中出现较多的Ｓｔｒｉａｔｏｔｈｅｃａ，Ｃｏｒｙｐｈｉｄｉｕｍ和Ａｒｂｕｓｃｕｌｉｄｉｕｍ等，认为本区可能属地中海疑源类生物区，详细研究这些化石对认识疑源类组合与笔石带的关系有重要意义。

DISCOVERY OF ARENIGIAN ACRITARCHS FROM SANDU,GUIZHOU AND ITS GEOLOGICAL SIGNIFICANCE

A diverse and well-preserved acritarch assemblage has been discovered from the Lower Member of the Tonggao Formation (graptolite biozones N_1-N_4) in the Sandu Area,Guizhou for the first time. Previously most members of this assmblage were found in Arenigian-Llanvirnian rocks,some only in the Arenigian. The appearances of Coryphidium , Striatotheca, Arbusculidium,etc. in the assemblage suggest that the area probably belongs to the Mediterranean acritarch province. Further study in detail of these acritarchs would be of importance in revealing the relationship between graptolite biozones and acritarch assemblages.