Published online August 15, 2021
Copyright © International Union of Geological Sciences.
by Marie-Pierre Aubry1, Werner E. Piller2*, Philip L. Gibbard3, David A. T. Harper4 and Stanley C. Finney5
1 Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08873, USA
2 Institute of Earth Sciences, University of Graz, NAWI Graz Geocenter, Heinrichstrasse 26, 8010 Graz, Austria
3 Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge CB2 1ER, UK
4 Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
5 Department of Geological Sciences, California State University, Long Beach, USA
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The IUGS Executive Committee has voted unanimously to ratify the proposal for formal adoption of the chronostratigraphical/geochronological unit divisions subseries/subepoch within the International Stratigraphic Guide as approved by the International Commission on Stratigraphy and forwarded to the IUGS EC on 24 March 2021**. The subseries/subepochs are now incorporated in a six-tiered chronostratigraphic hierarchy of units that are formally defined by a designated GSSP (Global Stage Stratotype and Point) at the base of designated type stages. Henceforth, subseries/subepochs of the Cenozoic are to be denominated by capitalised positional adjectives -- Lower/Early, Middle, and Upper/Late – added to the names of the relevant series/epochs.