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本文描述的牙形刺采自陕西南郑梁山宝塔组石灰岩中。它们和头足类(Sinoceras chinense) 三叶虫(Phillpsinella sinica,Par(?)philipsinella globosa,Hammatocnemis)共生在一起,其中的牙形刺化石 Amorphognathus ordovicicus 为多分子器管属种,计有 amorphognathiform el.,tetra- prioniodiform el.,prioni odiform and keiselognathiform el.还含有 Amorphognathus cf.su- perbus,Scabbardella allipes ac.el,等.典型的晚奥陶世的 Amorphognathus ordovicicus 牙形刺带化石就发现在宝塔组中下部。笔者根据所发现的牙形刺资料,三叶虫化石并结合共生的其它化石认为宝塔组时代应归到卡拉道克中晚期至阿什及尔早期。
The conodont described in this paper was collected from limestone in Liangshan Pagoda Formation in Nanzheng, Shaanxi Province. They are symbiotic with the Sinoceras chinense trilobite (Phillipsinella sinica, Par (?) Philipsinella globosa, Hammatocnemis), of which Amorphognathus ordovicicus is a multi-organism species with amorphognathiform el. , also contains Amorphognathus cf.su-perbus, Scabbardella allipes ac.el, etc. Typical Late Ordovician Amorphognathus ordovicicus conodont fossils found in the pagoda group Lower part. According to the author found conodont data, trilobite fossils and other symbiotic fossils associated with the Pagoda group that should belong to the era of the middle of Karadak to Ashgur early.