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西秦岭早奥陶世的笔石首先由甘肃省地质矿产局区调队于1980年10月发现,地点在甘肃省迭部县城东约5km处的拉路村东侧拉路沟沟口。何荔莉、赵凤游(1982)报道有:Didymograptus sp., D. cf. suecicus, D. cf.filiformis, D. extensus,Tetragraptus sp.,T.cf. bigsbyi,T.pendens Elles,Loganographtus sp..
The early Ordovician penoliths of the Western Qinling were first discovered by the Gansu Provincial Geological and Mineral Administration District Transfer Team in October 1980 and located at the Raluogou Mizoguchi, east of Lalu Village, about 5km east of Diebu County, Gansu Province. He Lili, Zhao Fengyou (1982) reported: Didymograptus sp., D. cf. suecicus, D. cf.filiformis, D. extensus, Tetragraptus sp., T.cf. Bigsbyi, T. pendens Elles, Loganographtus sp.