江汉盆地通海口海4井早奥陶世疑源类化石

Early Ordovician Acritarchs from the Well Hai4 in Tonghaikou Area of Jianghan Basin,Hubei

报道了湖北江汉盆地通海口地区海４井２０２０～２０６０ｍ井段的疑源类化石，共计２２属２９种（其中比较种４个、新种２个、未定种１０个），这些疑源类类型仅见于我国西南地区的下奥陶统。这一发现，对探讨早奥陶世海洋微体浮游植物（疑源类）的区域分布及扬子地台古地理位置。

The acritarchs at the depth 20202060m obtained from the well Hai4 in the Tonghaikou area of the Jianghan basin,Hubei province are totalled up to 22 genera,29 species,including 4 comparative, 2 new and 10 unknown speciesThe forms of acritarchs are known only from early Ordovician of Southwest China which provide,undoubtedly,significant evidence for seeking the microphytoplanktonic(acritarchs) distribution and paleogeographic position of the Yangtze platform during the early Ordovician epoch