The 2021 version of the North American Stratigraphic Code is not a major revision. It simply states the changes mandated by the three approved amendments published in Easton et al. (2017), Brett et al. (2019), and Aubry et al. (2020), which contain modifications to Articles 13, 25, 26, 27, 37, 73, 81, 82, and Table 2. For completeness, the composition of the North American Commission on Stratigraphic Nomenclature has been updated in Appendix II, and citations to Notes and Reports of the Commission since 2005 have been added to Appendix III. These changes follow Code amendment procedures as outlined in Article 21.
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