MIDDLE CAMBRIAN CONODONTS FROM THE QILIAN MOUNTAINS
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摘要: 青海大通中寒武统毛家沟群产丰富的牙形石，共有７属８种，以原牙形石Ｊｉａｎｇｓｈａｎｏｄｕｓａｆ．ｔｒｉａｎｇｕｌｕｓ、Ｇａｐｐａｒｏｄｕｓｂｉｓｕｌｃａｔｕｓ、Ｐｈａｋｅｌｏｄｕｓｔｅｎｕｉｓ占优势，而副牙形石Ｗｅｓｔｅｒｇａａｒｄｏｄｉｎａ、Ｐｒｏｏｎｅｏｔｏｄｕｓ仅有少数个体。与华北和华南相比，这一组合所含副牙形石的比重明显降低，而且缺乏Ｌａｉｗｕｇｎａｔｈｕｓ、Ｆｕｒｎｉｓｈｉｎａ等类型（图版１）。Abstract: There occur abundant conodonts in the Middle Cambrian Maojiagou Group in Datong county, Qinghai province.They include 7 genera and 8 species.The fauna is characterized by predominance of the protoconodonts Jiangshanodus aff. triangulus, Gapparodus bisuleatus and Phakelodus tenuis, only a few individuals of the paraconodonts Westergaardodina sp. and Prooneotodus sp. being present. In comparison with North China and South China,the proportion of paraconodonts in this assemblage decreases notably and Laiwugnathus and Furnishina are lacking.
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Key words:
- conodont /
- Middle Cambrian /
- Qilian Mountains
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