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“Stratigraphy is a magnificent subject—magnificent in its breadth and scope, magnificent in its importance to so many lines of human endeavor. It is essentially that branch of geology which deals with the arrangement, the distribution, and the chronological succession of rock strata (and other associated rock bodies), with respect to any or all of the various characters, properties, and attributes which rocks may possess.“ Hollis D. Hedberg, the leading figure in the field of stratigraphy for over half a century, defined the subject in those words in a paper titled “Stratigraphic Classification and Terminology,” published in Volume 42 of the Bulletin of the American Association of Petroleum Geologists in 1958. Since that time the field has grown tremendously in both breadth and scope and now comfortably incorporates under its aegis such diverse disciplines as paleomagnetic, stable isotopic, and seismic stratigraphy in addition to the more classic biostratigraphy and geochronology.