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宁镇山脉地区奥陶系是我国东南地区标准剖面,文中在原有地层划分的基础上,除最上部的五峰组以外,其它8个组中均发现牙形石,并且建立了16个牙形石化石带。同时在文中把本区的16个牙形石化石与国內外一些奥陶系标准地区对比。特别是与宜昌三峡地区对比过程中,发现除个别化石带以外,其它均可以对比,因此为长江中、下游地区钻井寻找下古生界油、气提供了划分奥陶系的微体化石依据。文中还描述了三个牙形新种化石。
The Ordovician area in Ningzhen Mountain Range is a standard section of southeastern China. Based on the original stratigraphic division, in addition to the uppermost Wufeng Formation, conodont was found in the other eight groups and 16 forms of conodont Stone belt. In the meantime, 16 conodont fossils in this area are compared with some Ordovician standard areas at home and abroad. Especially in comparison with the Three Gorges area of Yichang, it is found that except for individual fossil belts, the others can be compared with each other. Therefore, drilling for the Lower Paleozoic oil and gas in the middle and lower reaches of the Yangtze River provides basis for the classification of Ordovician microfacies. The article also describes three new species of dentate fossils.