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
A-B.采自奥斯陆附近Naersner 剖面的 Rhabdiopora praeparabola (= R. parabola 的幼年期复体); C-D. 加拿大 绿岬剖面106.4 m处所发现的最低位的浮游笔石; C. Rhabdiopora praeparabola (= R. parabola 的幼年期复体);D.cf.“ Staurograpyus ” sp.;E-F.白山大阳岔小洋桥剖面奥陶纪最低层位的 Rhabdinopora parabola (= R.praeparabola ),E. 成年期附体,F. 幼年附体(比例尺与钱币:20 mm)