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位于华北地台西缘的内蒙古乌海地区奥陶纪沉积环境与华北地台主体差异非常明显,属典型的台缘深水沉积,产出的动物群也主要表现为深水类型。王志浩等(1984)和安太庠等(1990)曾对该区奥陶系的牙形类进行过大量卓有成效的研究。近年来奥陶系牙形类分类与生物地层进展很大。笔者近年来对乌海地区奥陶系老石旦东山剖面、卧龙岗剖面、哈吐克沟剖面、工业园北剖面和工业园东剖面进行了系统的牙形类样品采集,采得的89块样品中80块产出丰富的牙形类化石,属种分异度高,共鉴定出30属89种,主要为华南型,底部和顶部见少量华北型。
The Ordovician sedimentary environment in Wuhai, Inner Mongolia, located on the western margin of the North China Platform, differs greatly from the main body of the North China Platform. It is a typical deep margin deposition in the margin of the margin of the margin and the fauna that is mainly produced is also of the deep-water type. Wang Zhihao et al. (1984) and Antaeus et al. (1990) have conducted a number of fruitful studies on the Ordovician teratos in the area. In recent years, the Ordovician teratoid taxonomy and bio-stratum have made great progress. In recent years, the authors have systematically collected samples of tooth-shaped samples collected from the Ordovician Dongdadian section, Wolonggang section, Hantukigou section, the north section of Industrial Park and the east section of Industrial Park in the Wuhai area. Totally 80 albumen-rich fossil species were found in the sample, with high species differentiation. A total of 89 genera of 30 genera were identified, mainly of South China type and a few of North China type at the bottom and top.