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1981年地质矿产部地质研究所陆相二、三叠系研究组与甘肃省地质矿产局地质矿产研究所合作,开展北祁连地区的二、三叠系的考察,在以往没发现过化石的红层中找到了骨化石,是这年考察最主要的收获之一.玉门大山口的西大沟组上部的骨化石点经1981,1982和1985年3次初步发掘,表明是一处埋藏丰富尚待研究的晚二叠世脊椎动物群.于1991年和1992年做了两次较大规模的发掘.现已修复约1/2的标本,初步研究结果显示出这一脊椎动物群的总面貌,与俄罗斯地台晚二叠世早期Ⅱ带和南非新建立的始二齿兽带关系密切.
In 1981, the Terrestrial II-Triassic research group of the Institute of Geology and Mineral Resources of the Ministry of Geology and Mineral Resources cooperated with the Institute of Geology and Mineral Resources of Gansu Bureau of Geology and Mineral Resources to carry out the investigation of the Triassic in the North Qilian. In the past, no fossil Found in the red layer of bone fossils, is one of the most important harvest this year inspection.Ogmenia Yumen Dachanggou upper part of the fossil site 1981,1982 and 1985 three preliminary excavations, that is a burial Enriched in the late Permian vertebrate fauna yet to be studied Two large-scale excavations were undertaken in 1991 and 1992. Approximately one-half of the specimens have now been repaired and preliminary studies have shown that this vertebrate fauna The general appearance is closely related to the Ⅱ Late Late Permian belt on the Russian platform and the 2 newly established Tooth Belt in South Africa.