Brett, C.E., Pratt, B.R., Landing, E., 2019. NORTH AMERICAN COMMISSION ON STRATIGRAPHIC NOMENCLATURE Report 13 -- Revision of Articles 25-27 of the North American Stratigraphic Code to Allow Formal Submembers. Stratigraphy 16, 279 - 281. doi:10.29041/strat10.29041/strat.16.410.29041/strat.16.4.279-281

Brett, C.E., Pratt, B.R., Landing, E., 2018. NORTH AMERICAN COMMISSION ON STRATIGRAPHIC NOMENCLATURE Note 68 - Application for Addition of Submembers to the North American Stratigraphic Code: A Case for Formalizing Lithostratigraphic units of Intermediate Rank. Stratigraphy 15, 103 - 108. doi:10.29041/strat.15.2.103-108