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巴丹吉林地区位于我国北边,与蒙古人民共和国相毗邻,它包括弱水河以东、巴丹吉林沙漠及其以北的地区(图1)。由于地域偏僻,该区地质研究程度颇低,只进行过一百万分之一的区域地质测量,从未有过关于寒武、奥陶系的报导。1977—1978年,由宁夏地质局综合研究队和西安地质矿产研究所部分地层古生物工作者组成的地层小组,对沙漠以北的古生代地层进行了调查,首次在该区发现了富含动物化石的寒武系和奥陶系,现将其报导如下。
The Badain Jaran area is located in the north of our country and is adjacent to the People’s Republic of Mongolia. It includes the east of Weak River and the Badain Jaran Desert and its north (Figure 1). Because of its remote area, the geological research in this area is rather low. Only one part per million geological survey has been conducted. There have never been any reports about Cambrian and Ordovician. From 1977 to 1978, a group of stratums composed of a comprehensive research team from Ningxia Bureau of Geology and some paleontologists from the Xi’an Institute of Geology and Mineral Resources investigated the Paleozoic strata to the north of the desert. For the first time, the fossil-rich fauna Cambrian and Ordovician, now reported as follows.