摘要
本文通过对江汉盆地西北缘下第三系剖面的研究,建立了下第三系地磁极性年代系统,得出了地层形成时期的古纬度;在前人所划下第三系中发现了典型的晚白垩世介形类Talicyprideachinensis,Cypria triangularia等,结合地磁极性年代,将第三系底界上移45.3m。
Based on the studies of the outcrop of Eogene System on the northwest margin of Jianghan Basin, the following results have been obtained: establishment of Eogene paleomagnetic polar time table, Eogene paleolatitude at that area and a discovery of upper Cretaceous index fossil Talycyprideu chinensis in previous“Eogene System”. In considera- tion of the discovery and paleomagnetic time table, the Tertiary basal boundary has been corrected by moving 45.3m upward.
出处
《石油学报》
EI
CAS
CSCD
北大核心
1992年第2期121-126,共6页
Acta Petrolei Sinica
