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Absolute geologic age dating

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Since publication of a chart showing divisions of geologic time in the seventh edition of the USGS guide Suggestions to Authors (Hansen, 1991), no other time scale has been officially endorsed by the USGS. M., 2008, The concise geologic time scale: Cambridge, U. For consistent usage of time terms, the USGS Geologic Names Committee (GNC; see box for members) and the Association of American State Geologists (AASG) developed Divisions of Geologic Time (fig. (Also available at Ogg, Gabi, comp., 2009, Global boundary stratotype sections and points (GSSP): International Commission on Stratigraphy, accessed May 10, 2010, at

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Over the years, the development of new dating methods and the refinement of previous methods have stimulated revisions to geologic time scales. Advances in stratigraphy and geochronology require that any time scale be periodically updated. Geological Survey (USGS), State geological surveys, academia, and other organizations have sought to create a consistent time scale to be used in communicating ages of geologic units in the United States. Therefore, Divisions of Geologic Time, which shows the major chronostratigraphic (position) and geochronologic (time) units, is intended to be a dynamic resource that will be modified to include accepted changes of unit names and boundary age estimates. Many international debates have occurred over names and boundaries of units, and various time scales have been used by the geoscience community. R., comp., 1983, The Decade of North American Geology [DNAG] 1983 geologic time scale: Geology, v. An initial step in that process had to be the generation of clumps of solid material.Previously, researchers believed the two known types of early solids formed several million years apart from each other.Geologic Time Scale: Divisions of Geologic Time approved by the U. It reflects ratified unit names and boundary estimates from the International Commission on Stratigraphy (Ogg, 2009). * Changes to the time scale since March 2007 (see text). URL: Effective communication in the geosciences requires consistent uses of stratigraphic nomenclature, especially divisions of geologic time.