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四川广元县朝天火车站北北西约250米的山坡上,出露一套厚约20-30米的污绿色钙质页岩夹疣状泥质灰岩。其上(雨復)一套以页岩,粉砂岩为主的细碎屑岩。下伏为中—厚层壳相灰岩,含丰富的珊瑚及少量三叶虫化石等。在疣状泥灰岩中,作者于1965年9月与地质队陈敦齐、赖丁香同志,采集了一些腕足类化石,以小无洞贝(Atrypella)为代表。该属广泛分布于西欧、苏联、北美各地,对于解决我国川北究竟有无晚志留世的沉积,以及壳相志留系的对比,都有着一定实际意义,故描述于此。
Sichuan Guangyuan County Chaotian railway station about 250 meters north-west on the slopes, exposing a set of about 20-30 meters thick green calcareous shale folder verrucous mud limestone. On it (rain complex) set of shale, siltstone-based fine clastic rock. Under the medium-thick layer of limestone, rich in coral and a small amount of trilobite fossils. In verrucous marl, in September 1965, the authors collected some brachiopod fossils, represented by Chen Tunqi and Lai Dingxiang from the geology team, represented by Atrypella. The genus is widely distributed in Western Europe, the Soviet Union and North America. It is of practical significance to solve the problem of the late depositional sedimentation in North Sichuan and the comparison of Silurianism in the continental shelf. Therefore, it is described here.