https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/fullf.web&search1=R=312790
Rechercher Groves, J R; Rechercher Yue, W; Rechercher Yuping, Q; Rechercher Richards, B C; Rechercher Ueno, K; Rechercher Xiangdong, W
2012
The Visean-Serpukhovian boundary is not yet defined by a Global Stratotype Section and Point (GSSP) but it is recognizable operationally by the appearance of...
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