摘要:
却尔却克山、雅尔当山位于新疆尉犁县库鲁克塔格以南,孔雀河以北,构造位置上处于塔里木地台库鲁克塔格断隆南缘。该地寒武、奥陶纪地层发育良好,层序清楚,化石丰富,是研究寒武系与奥陶系的理想地段。却尔却克山寒武、奥陶纪地层是新疆发现较早的地点,但研究程度却很低。1981年笔者在该区进行了区域地质调查工作,又新发现了雅尔当山的寒武、奥陶纪地层,并在该区测制了完整的地层剖面,采到了丰富的三叶虫、笔石等化石。根据化石、岩性组合,将该区寒武系、奥陶系划分如下: 上奥陶统乌里格孜塔格组划分有第二段（O3W~2）及第一段（O3W~1）。中奥陶统却尔却克组划分有第五段（O2q~5）、第四段（O2q~4）、第三段（O2q~3）、第二段（O2q~2）及第一段（O2q~1）。
Abstract:
In 1981, the authors measured complete and continuous Cambrian and Ordovician sections and collected a lot of fossils in the Queerqueke and Yaer- dang mountains in Xinjiang. On the basis of fossil assemblages and lithologic associations, stratigraphic division and correlation were made. The deposition that took place between the Cambrian and Ordovician in the area was contin- uous. In the sections the authors discovered the Jiangnan-type fauna——the Late Cambrian Hedinaspic-Charchaqia-Lotagnostus-Westergaardites assemblage ——and the Early Ordovician Hysterolenus zone, which confirms that the contact betweeen the Upper Cambrian and the Lower Ordovician is conforma- ble. The actual materials show that the Cambrian and Ordovician strata in the area are completely developed, distinct in sequence and simple in structure. Therefore, the area is one of the ideal areas for studying the Cambrian and Ordovician strata and their boundary.
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