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(en) Xu Chen, Jiayu Rong, Junxuan Fan, Renbin Zhan, Charles E. Mitchell, David A.T. Harper, Michael J. Melchin, Ping'an Peng, Stan C. Finney et Xiaofeng Wang, « The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (the uppermost of the Ordovician System) », Episodes, vol. 29, no 3, , p. 183-196 (ISSN0705-3797, lire en ligne [PDF]).
issn.org
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(en) Xu Chen, Jiayu Rong, Junxuan Fan, Renbin Zhan, Charles E. Mitchell, David A.T. Harper, Michael J. Melchin, Ping'an Peng, Stan C. Finney et Xiaofeng Wang, « The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (the uppermost of the Ordovician System) », Episodes, vol. 29, no 3, , p. 183-196 (ISSN0705-3797, lire en ligne [PDF]).