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近年来,随着我国地质事业的发展,我国早泥盆世地层及志留、泥盆系的分界,已引起广大地质工作者的重视.国际上,关于志留、泥盆系的分界已作出决议,即以笔石Monograptvsvniformis三叶虫Warburgella rugolosa rugolosa和牙形刺Icrlodus woschmidti的同时出现作为泥盆纪的开始.在欧洲,早泥盆世牙形刺分为7个带,北美分为6个带,牙形刺早已成为洲际间泥盆纪地层对比的重要依据.在我国广西下泥盆统的那高岭组、郁江组、二塘组和四排组均已发现了牙形刺,并已确立了由Eognathodus sulcatus到Polygnathus serotinus的5个牙形刺带.
In recent years, with the development of geology in our country, the boundary between the Early Devonian strata and the Silurian and Devonian in our country has drawn great attention from the geologists .In the world, the delineation of the Silurian and Devonian has been made The resolution begins with the simultaneous appearance of the Monolithptvsvniformis Warburgella rugolosa rugolosa and the conodont Icrlodus woschmidti as the beginning of the Devonian. In Europe, the Early Devonian conodonts were divided into seven zones, six in North America And conodont has been an important basis for the comparison of the Devonian strata during the intercontinental.The conodont has been found in the Naojiaoling, Yujiang, Ertang and the fourth row of the Lower Devonian in our country Five conodonts have been established from Eognathodus sulcatus to Polygnathus serotinus.