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NORTH AMERICAN STRATIGRAPHIC CODE

The first 20% of the full text of this article appears below.

FOREWORD TO THE REVISED EDITION

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 sections of the Code. In addition, Figures 1, 4, 5, and 6, as well as Tables 1 and Tables 2 have been modified. Most of the changes adopted in this revision arose from Notes 60, 63, and 64 of the Commission, all of which were published in the AAPG Bulletin. These changes follow Code amendment procedures as outlined in Article 21.

View larger version (32K): [in this window] [in a new window]   Figure 1 Relation of geologic time units to the kinds of referents on which most are based.

View larger version (19K): [in this window] [in a new window]   Figure 4 Examples of range, lineage, and interval biozones.

View larger version (12K): [in this window] [in a new window]   Figure 5 Examples of assemblage and abundance biozones.

View larger version (23K): [in this window] [in a new window]   Figure 6 Relation between pedostratigraphic units and pedologic profiles. The base of a geosol is the lowest clearly defined physical boundary of a pedologic horizon in a buried soil profile. In this example it is the lower boundary of the B horizon because the base of the C horizon is not a clearly defined physical boundary. In other profiles, the base may be the lower boundary of a C horizon. Pedologic profile modified from Ruhe (1965) and Pawluk (1978).

View larger version (28K): [in this window] [in a new window]   Table 2 Categories and Ranks of Units Defined in This Code*

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