Divisions of geologic time-major chronostratigraphic and geochronologic units
Fact Sheet
2010-3059
By: U.S. Geological Survey Geologic Names Committee
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- Documents:
- Related Works:
- Fact Sheet 2018-3054 - Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units
- Fact Sheet 2007-3015 - Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units
- Superseded Publications:
- Superseding Publications:
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Abstract
Effective communication in the geosciences requires consistent uses of stratigraphic nomenclature, especially divisions of geologic time. A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years. 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. 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. This fact sheet is a modification of USGS Fact Sheet 2007-3015 by the U.S. Geological Survey Geologic Names Committee.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Divisions of geologic time-major chronostratigraphic and geochronologic units |
| Series title | Fact Sheet |
| Series number | 2010-3059 |
| DOI | 10.3133/fs20103059 |
| Year Published | 2010 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | Geologic Names Committee |
| Description | 2 p. |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | N |