By design, the North American Stratigraphic Code is meant to be an evolving document, one that requires change as the field of earth science evolves. The revisions to the Code that are included in this 2005 edition encompass a broad spectrum of changes, ranging from a complete revision of the section on Biostratigraphic Units (Articles 48 to 54), several wording changes to Article 58 and its remarks concerning Allostratigraphic Units, updating of Article 4 to incorporate changes in publishing methods over the last two decades, and a variety of minor wording changes to improve clarity and self-consistency between different...

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