对沈北第三系地层时代的探讨

AN APPROACH OF THE STRATIGRAPHICAL AGE OF THE TERTIARY IN THE SHENYANG C0ALFIELD LIA0NING

根据同位素年令资料,本文将木梳屯组的时代置于晚白垩世—古新世;通过对生物地层资料的再研究,肯定杨连屯组的时代为始新世,并将其底部杂色泥岩及凝灰岩段与抚顺古城子组对比;根据岩石地层学和构造地层学特征,将杨连屯组洋河段独立为洋河组,时代暂定为始—渐新世,并对邱家屯组的时代提出疑问。

In this paper, the age of Mushutun Formation is assigned to the late Cretaceous-Paleocene epoch, based on the data of isotopic age. After the restudy of the data of the biostrata, the age of Yangliantun is assigned to the Eocene epoch. A comparison between its bottom variegated claystone and tuff section and Guchenzi Formation of Fushun is made. According to the features of rock stratigraphy and structural stratigraphy, the Yanghe section is named as an independent Formation-the Yanghe Formation and its age is defined as Eo-Oligocene temporarily. And the age of the Qiujiatun Formation is challenged.