The recommended Cambrian - Ordovician global Boundry stratotype of the Xiaoyangqiao section (Dayangcha, Jilin Province), China
J. W. Chen,
Y. Y. Qian,
J.M. Zhang,
Y. K. Lin,
L. M. Yin,
Z. H. Wang,
Z. Z. Wang, and
J. D. Yang. Y. X. Yang
1988
Article
Geological Magazine
125(4):415-444
Find it at:
http://dx.doi.org/http://dx.doi.org/10.1017/S00167