At the 74th Annual Meeting of the North American Commission on Stratigraphic Nomenclature, 23 September, 2019, in Phoenix, Arizona, the Commission voted unanimously to accept the revision of Articles 25-27 of the North American Stratigraphic Code (North American Commission on Stratigraphic Nomenclature, 2005), and concomitant changes to Table 2 and remarks in Articles 22, 23, and 30 printed below; specific revisions of the Code are indicated in red color. These replace all older versions of the specified Articles. An application for this revision (Brett et al. 2018) was published in Stratigraphy more than one year prior to the meeting; thus, the vote on this application for revision follows Article 21 of the Code. This revision explicitly allows the use of submembers in formal lithostratigraphic nomenclature.