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西藏南部箭石相当丰富,杨遵仪、吴顺宝(1964)、尹集祥(1976)先后作了报导。以往报导的箭石层位主要是上侏罗统和下白垩统。尹集祥还描述了一个晚三叠世的箭石 (Aulacoceras)。1980年作者参加地质部高原地质调查大队十一分队工作在聂拉木县聂聂雄拉及拉弄拉地质剖面上收集了较多箭石标本。除了晚侏罗世的箭石层位外,又发现了两个新的箭石层位,一个是中侏罗世的,相当于卡洛夫期的层位。另一个是早侏罗世晚期的, 相当于托尔期的层位。这些新的发现,不仅增添了箭石产出层位,而且在区域地层对比上也具有一定意义。
There are quite a few arrowheads in southern Tibet. Yang Zunyi, Wu Shunbao (1964) and Yin Jixiang (1976) reported successively. The previously reported stone layers are mostly Upper Jurassic and Lower Cretaceous. Yin Jixiang also described a late Triassic arrow stone (Aulacoceras). In 1980, the author took part in the work of the Eleventh Unit of the Geological Survey Plateau in the Ministry of Geology, collecting more stone specimens on the Niexiongla and Lagongla geological sections in Nyalam County. In addition to the late Jurassic lithosphere, two new lithospheric layers were discovered, one in the Middle Jurassic and corresponding to the Kalovian horizon. The other is in the early Jurassic, which is equivalent to the Tollean horizon. These new findings not only add to the output of the lithosphere, but also make some sense in regional stratigraphic comparisons.