Two others of these trilobite fossils have been found in the same area . 在同一地区还发现了另外两块这些三叶虫化石。
2.
Trilobites were rapidly evolving forms and are of widespread use in biostratigraphic studies . 三叶虫是进化迅速的种型，并广泛用在生物地层学的研究上。
3.
Mei shi - long , 1991 . middle and late cambrian conodont and trilobite biostratigraphy in wanxian , hebei . unpublished ph . d thesis of peking university 武桂春, 2003 .鲁西地区晚寒武世牙形石.北京大学博士研究生学位论文
4.
The new framework , comprising a pre - trilobite series and three trilobite - dominated series , reflects the major evolutional stages of the life on earth during cambrian period 新的划分方案包括1个“前三叶虫统”和3个“三叶虫优势统” ，反映了寒武纪生命发展的主要阶段。
5.
Each series in the new framework represents approximately the same length of the time and the stage boundaries are defined by significant bio - events as well as cosmopolitan or intercontinental species of trilobites 各统的时间跨度大体相等，阶的界线采用重要的生物事件或具有全球对比意义的物种定义。
6.
From the late middle ordovician to the end of ordovician , the cephalopods , gastropods and corals in the erlangping trough , and the conodonts , coral , brachiopods , cephalopods as well as trilobites in the xichuan shelf were from the north china province 在中奥陶世晚期至奥陶纪末，二郎坪海槽的腹足类、头足类和珊瑚与浙川陆棚的牙形石、珊瑚、腕足类、头足类和三叶虫均属华北生物省。
7.
From the cambrian to the early middle ordovician , the cambrian radiolaria and the early ordovician conodonts of the erlangping trough in the northern part of eqm , and the cambrian trilobites and early ordovician conodonts as well as cephalopods of the northern xichuan shelf in the southern part of eqm belonged to the south china province , while the cambrian trilobites and the early ordovician conodonts of the southern xichuan shelf belonged to the south china province with some elements of the north china province 在寒武纪至中奥陶世早期，东秦岭北部二郎坪海槽的寒武纪放射虫和早奥陶世牙形石与东秦岭南部浙川陆棚北部的寒武纪三叶虫、早奥陶世牙形石和头足类属华南生物省，而浙川陆棚南部的寒武纪三叶虫和早奥陶世牙形石属于华南生物省，兼有华北生物省分子。
