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文中记述塔北井下奥陶系的牙形类38属67种,描述其中1新属,4新种,1新亚种。与国内外对比,该区自下而上当前可建立22个牙形类序列(带或组合带)。建议以第5带Pteracontiodus exilis的首现作为塔里木盆地中奥陶统的底界线,从而将鹰山组划分为上、下两组。再结合其它诸如岩石地层、测井地层等综合研究,对塔里木盆地奥陶系现进一步划分为3统7组16个段,以便为研究该地区地层对比和寻找油气资源服务。
The paper describes 67 species of 38 genera of the Ordovician in the Tarim Basin, describing 1 new genera, 4 new species and 1 new subspecies. In contrast to home and abroad, up to now, 22 teratoid sequences (bands or bands) can be established in the area from the bottom up. It is suggested that the first occurrence of the fifth Pteracontiodus exilis be used as the bottom line of the Middle Ordovician in the Tarim Basin to divide the Yingshan Formation into upper and lower groups. Combined with other comprehensive researches such as rock strata and logging strata, the Ordovician in Tarim Basin is further divided into 16 groups of 3 groups and 7 groups in order to study stratigraphic correlation and find oil and gas resources in this area.