湖北南襄盆地枣阳凹陷第三纪轮藻化石及其地层意义

TERTIARY FOSSIL CHAROPHYTES FROM THE ZAOYANG DEPRESSION,NANXIANG BASIN AND THEIR STRATIGRAPHICAL SIGNIFICANCE

本文研究了南襄盆地枣阳凹陷第三系玉皇顶组到凤凰镇组轮藻化石。共划分出４个组合，其时代分别属早始新世、中始新世、晚始新世和渐新世。

Tertiary fossil charophytes collected from the Zaoyang Depression,Nanxiang Basin, Hubei Province, consist of 37 species in 17 genera.These charophytes may be subdivided into 4 assemblages belonging to Early Eocene, Middle Eocene, Late Eocene and Oligocene in age respectively.The Upper Tertiary is very poor in charophytes from which no assemblages can be recognized.