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陇县龙门洞的平凉组最早由田在艺(1948)采得笔石两层,穆恩之(1959)认为系中奥陶纪产物,和平凉页岩相当。西北有关的石油、地质、区测单位,亦先后在这一带工作。1962年车福鑫在这一带发现上奥陶统背锅山组,次年罗守文、景伯勤与笔者在郭勇岭、车福鑫和陈汉均的带领下,在这一带对奥陶系作了进一步工作,测制了龙门洞平凉组剖面,系统采集了笔石标本,发现这里平凉组剖面中笔石动物群非常丰富,虽然大部分尚未研究,仅根据一些外形特征明显容易鉴定的属种大致可分为五个笔石带,并可与英国标准笔石带对比。
The Pinglian Formation in Longmen Cave, Longxian County, was originally obtained from Tiandi Art (1948) by two layers of pen-stone. Mu’en’s (1959) thought that the Ordovician product was equivalent to the Pingliang shale. Northwest related petroleum, geology, and regional survey units also successively work in this area. In 1962, the car Fuxin found the upper Ordovician backcountry group in this area. In the following year, under the leadership of Guo Yongling, Fu Xin and Chen Hanjun, Luo Shouwen and Jing Boqin made further progress in this area Work, measured the Longmen hole Pingliang group profile, the system collected pen specimens, found here Pingliang group profile pen petrified fauna is very rich, although most have not been studied, only based on some of the appearance characteristics of the species can be easily identified roughly genus Divided into five pen-stone, and contrast with the British standard pen-stone.