全球奥陶系底界的“金钉子”问题及我国特马豆克阶(Tremadocian)的划分与对比
汪啸风1, MALETZJörg3, 王传尚1, 阎春波1

On the Problem of Global Ordovician Lower Boundary “Golden Spike” and Tremadocian Subdivision and Correlation in China
WANG Xiao-feng1, STOUGE Svend2, MALETZ Jörg3, WANG Chuan-shan1, YAN Chun-bo1
左图白线示纽芬兰绿岬剖面23层GSSP的具体层位;右图红线示该剖面25层(Bed 25)上部(106.4 m处)黑灰色页岩夹层中产最早浮游正笔石的层位