The distinction between unit stratotypes and boundary stratotypes of time-stratigraphic units recently has been clearly defined in reports by several international groups and by writers in other countries, but this distinction is not evident in the Code of the American Commission on Stratigraphic Nomenclature (1970). The distinction is useful, for it promises to resolve many of the controversies that have confronted stratigraphers regarding time-stratigraphic classification and correlation. For this reason, it is desirable that the point-boundary stratotype concept be introduced to the Code. This change is consistent with an objective of the Commission to attempt to reconcile some differences...

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