贵州布寨泥盆纪生物礁的古生物学和古生态学特征

贵州布寨泥盆纪生物礁发育在独山组的鸡泡段和鸡窝寨段,大部分是骨架礁,主要由层孔虫和床板珊瑚构成。部分是障积礁,主要由枝状床板珊瑚和藻类构成。在礁组合中可识别出4个生物群落和一个生物组合,各生物群落和生物组合发育于各自互不相同的环境。根据生物群落和生物组合的生态分析及与邻区礁组合的生物群落对比,认为布寨礁发育在环境条件较为稳定的浅海,海水的温度、含盐度、清洁度、深度和水动力条件都比较适合造礁生物生长。图2,参9。

Palaeontology and palaeoecology characteristics of devonian reefs in Buzhai of Guizhou

Devonian reefs in Buzhai of Guizhou developed in the Jipao Member and Jiwozhai Member of Dushan Formation. They are mostly frame reefs, built mainly by stromatoporoids and tabulate corals. Some are the baffle reefs, built mainly by dendroid tabulate corals or algae. Four communities and an association are recognized in the reef complex. The Ilmenia-Classialveolites community is characterized by small brachiopods and dendroid tabulate corals and occupies in the lower-turbulent shallow sea. The Thamnopora - Stringocephalus community consists of the the dendroid tabulate corals and big brachiopods and develops in the open shallow sea. The Stromatopora-Alveolites community is the very important reef-building community, characterized by the massive stromatoporoids and various corals. The blue-green algae community is the builder of the baffle reefs. The Cyclocyclicus-Clathrocoilona association is composed of the crinoids and thin-bed stromatoporoids and develops in bank facies. By the ecological analysis and comparison with the reefs in neighboring areas, the reef complex developed in a stabile shallow marine environments, where was more suitable for growth of reef-build organisms. 2figs. ,9refs.