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前言贺兰山挺拔于腾格里沙漠和宁夏黄河灌区平原之间,习惯上可以分为南、中、北三段三关之南称南段;三关与大武口之间称中段;大武口以北称北段(图1)。贺兰山是我国西北区寒武系发育较好的地区之一,寒武系最早发现于1943-1944年,工作甚简。1959年全国地层会议时,对本区寒武系也只是根据这一零星的资料作了一些介绍。近年来,宁夏地质局第二地质队(1973-1974年)和区域地质测量队(1974年)在贺兰山中、北段测制了不少寒武系剖面,采集了大量的化石,大大提高了本区寒武系的研究程度。
Foreword Mount Helan very straight in the Tengger Desert and Ningxia Yellow River Irrigation Plain, customarily can be divided into southern, central and northern sections of the south of the three said South; between the third and Dawukou called the middle; Dawukou north North section (Figure 1). Helan Mountain is one of the better developed Cambos in Northwest China. The Cambrian was first discovered in 1943-1944 and has a very simple job. During the 1959 National Stratum Conference, the Cambrian Department in this area made some introductions on the basis of this sporadic data only. In recent years, the Second Geological Team of Ningxia Bureau of Geology (1973-1974) and the Regional Geological Survey Team (1974) have made many Cambrian sections in the middle and northern sections of the Helan Mountains, collecting a large amount of fossils and greatly increasing The study area Cambrian level.