摘要
The Maoping Formation was named respectively and used for two different and unrelated 1ithological units. In 1966 the name was proposed by Wei Xiu zhe and others to define a suite of slightly metamorphosed slates of Early Ordovician age in Chongyi, Souhern Jiangxi. However, in 1968 the same term was used by Hubei Geological Survey for a suite of dolomites of Middle Cambrian age in Xianfeng, West Hubei, probably without having knowledge of this Homonymum. Unfortunately this name has since been used for decades separately by Cambrian and Ordovician biostratigraphers causing serious confusion, which will be clarified and discussed herein. According to the priority rule, the later name is invalid and should not be used again, and it is here suggested that a new name should be given to the Cambrian rock unit concerned. Lithologically Maoping Formation is also shown to be different from Jueshangou Formation defined for the Jinggang Mts. to the north of Chongyi region, and from Yinchufu Formation in Western Zhejiang. Therefore the term is regarded as valid, restricted to southern Jiangxi. Up to date, quite abundant but poorly preserved graptolites have been discovered from the rocks, indicating an age of early Tremadoc to possibly earliest Arenig age (Early Ordovician).
The Maoping Formation was named respectively and used for two different and unrelated 1ithological units. In 1966 the name was proposed by Wei Xiu zhe and others to define a suite of slightly metamorphosed slates of Early Ordovician age in Chongyi, Souhern Jiangxi. However, in 1968 the same term was used by Hubei Geological Survey for a suite of dolomites of Middle Cambrian age in Xianfeng, West Hubei, probably without having knowledge of this Homonymum. Unfortunately this name has since been used for decades separately by Cambrian and Ordovician biostratigraphers causing serious confusion, which will be clarified and discussed herein. According to the priority rule, the later name is invalid and should not be used again, and it is here suggested that a new name should be given to the Cambrian rock unit concerned. Lithologically Maoping Formation is also shown to be different from Jueshangou Formation defined for the Jinggang Mts. to the north of Chongyi region, and from Yinchufu Formation in Western Zhejiang. Therefore the term is regarded as valid, restricted to southern Jiangxi. Up to date, quite abundant but poorly preserved graptolites have been discovered from the rocks, indicating an age of early Tremadoc to possibly earliest Arenig age (Early Ordovician).
出处
《地层学杂志》
CSCD
北大核心
2002年第2期135-136,共2页
Journal of Stratigraphy
基金
国家重点基础研究发展规划项目 ( G2 0 0 0 0 7770 0 )
自然科学基金 ( No.4990 2 0 0 1)资助
关键词
茅坪组
下奥陶统
中寒武统
江西
湖北
Maoping Formation, Early Ordovician, Middle Cambrian, Jiangxi, Hubei
