Gerald M. Richmond, John G. Fyles; Application to American Commission on Stratigraphic Nomenclature for an amendment of Article 31, remark (b) of the Code of Stratigraphic Nomenclature on misuse of the term "stage". AAPG Bulletin ; 48 (5): 710–711. doi:
The main difficulties with this remark center around the term "climatic subdivisions" and the relationship of this term to the wording of the 1933 Code, in which the view that climatic change constitutes the basis for correlation of Pleistocene rock units is clearly stated in Article 3. A rewording of remark (b) of Article 31 is proposed for the 1961 Code.