上扬子区晚奥陶世海退的生态地层证据与冰川活动影响Ecostratigraphic evidence of the Upper Ordovician regressive sequences and the effect of glaciation
戎嘉余
摘要(Abstract)：
<正> 根据海域范围的不断窄缩,上扬子区晚奥陶世的海退现象,从古地理的变迁角度,早已证实(刘鸿允,1955;卢衍豪,1959;张文堂,1962;穆恩之等,1981等)。除了古地理方面外,是否还存在着其它的,例如生态地层(Ecostratigraphy)方面的证据呢?此外,引起上扬子区晚奥陶世海退的主要原因是什么?广布于上扬子区的赫南特贝动物群(Hir-
关键词(KeyWords)：
基金项目(Foundation):
作者(Author): 戎嘉余
DOI: 10.19839/j.cnki.dcxzz.1984.01.003
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