摘要
系统介绍城口廖子口奥陶系庙坡组几丁虫分布、发育特征及其与笔石生物带的关系 ,讨论了几丁虫的地层意义 ,并与国外典型地区同期地层的几丁虫进行了对比。城口廖子口庙坡组几丁虫的组合特征虽然与波罗的海地区、加拿大纽芬兰和魁北克地区同期地层的几丁虫存在一定的相似性 ,但总体上具有分布广、地质延限长。
The Ordovician Miaopo Formation at Liaozikou, near Chengkou of Chongqing is well exposed and developed. Systematic collection and study of the chitinozoan samples from this section indicate that chitinozoans are absent in most of samples while a few chitinozoans are present in the interval of graptolite Nemagraptus gracilis Zone. They are Belonechitina robusta, Conochitina cf. wesenbergensis, Conochitina elegans, Cyathochitina campanulaeoformis, Eisenackitina cf. uter, Lagenochitina sp.A, Laufeldochitina sp., Rhabdochitina gallica and Rhabdochitina cf. magna etc. Their stratigraphical significance and relationship with graptolite and conodont biozones and equivalent chitinozoan biozones in the other areas of the world are discussed. It is found that most of chitinozoans above mentioned are long-ranging and widespread, whereas Lagenochitina sp.A is known only from Hestedograptus teretiusculus and Nemagraptus gracilis zones in Newfoundland and Quebec of Canada.
出处
《地层学杂志》
CSCD
北大核心
2004年第3期230-234,i001,共6页
Journal of Stratigraphy
基金
国家自然科学基金项目 ( No.40 2 72 0 2 0 )资助
关键词
几丁虫
庙坡组
上奥陶统
廖子口
重庆
Chitinozoa, Miaopo Formation, Upper Ordovician, Chengkou, Chongqing
