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陕西陇县龙门洞的奥陶系最早由田在艺(1948)采得笔石两层,穆恩之(1959)认为系中奥陶统产物,和平凉页岩相当。1962年车福鑫在这一带发现上奥陶统背锅山组,次年笔者等随郭勇岭、车福鑫和成汉均,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,发现这里平凉组出露比原命名地点平凉官庄剖面的层位全,剖面中笔石动物群也非常丰富,以后又作过几次补充工作,仅根据一些外形特征明显的属种将其分为五个笔石带,并与欧美标准笔石带对比。
The Ordovician of the Longmen Cave in Long County, Shaanxi Province, was first mined in two layers of graphene by Tian Zaiyi (1948). Mu’enzhi (1959) considered that the Ordovician product is equivalent to the Pingliang Shale. In 1962, the car Fuxin found the upper Ordovician backcountry group in this area. In the following year, with the help of Guo Yongling, Fu Xin and Chenghan, I made further work in this area with the Ordovician, Pingliang group profile, the system collected pen specimens and found here Pingliang group exposed than originally named place Pingliang Guanzhuang section of the whole section of the pen stone fauna is also very rich, and later made several additional work, only According to some obvious features of the genus will be divided into five pen-stone belts, and with the United States compared to the standard pen-stone.