摘要
本文介绍了近年来作者等在江西武宁、皖南宁国、石台以及陕西西乡等地奥陶系顶、底界线研究中所取得的进展,奥陶系底界过去划得偏高,而奥陶系顶界又划得偏低。以往建立的岩石地层单位有的跨越了纪与纪的界面,就此讨论了岩石地层单位的跨时性,并对岩石地层单位的符号提出了个人的建议。
This paper discusses certain advances in the study of the Cambrian-Ordovician boundary and the Ordovician-Silurian boundary from Wuning County (Jiangxi Province), Ningguo County and Shitai County (South Anhui Province), Xixiang County (South Shaanxi Province). It is better to place the Cambrian-Ordovician boundary at the base of the Tremadocian Stage. Some lithostratigraphic units in different areas cross the Cambrian-Ordovician boundary. The author plases the Ordovician-Silurian boundary at the base of the Glyptograptus persculptus zone temporarily. Some lithostratigraphic units cross the Ordovician-Silurian boundary as well. It is needless to change the definition of the lithostratigraphic units. They (lithostratigraphic units) can cross the boundary between two neighbouring systems or two series or two erathems.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
1990年第2期291-298,共8页
Journal of Nanjing University（Natural Science）
关键词
奥陶系
界线
岩石地层单位
符号
Cambrian-Ordovician boundary
Ordovician-Silurian boundary
lithostratigraphic unit
