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- Global_Standard_Stratigraphic_Age abstract "In the stratigraphy sub-discipline of geology, a Global Standard Stratigraphic Age, officially abbreviated GSSA, is a chronological reference point and criterion in the world's rock records used to define the boundaries (an internationally sanctioned benchmark point) between different geological periods, epochs or ages on the overall geologic time scale in a chronostratigraphically useful rock layer. A worldwide multidisciplinary effort has been ongoing since 1974 to define such important metrics. But such work goes slowly despite a lot of effort, as one criterion is such points and strata need be widespread and contain an identifiable sequence of layers or other unambiguous marker (identifiable or quantifiable) attributes.GSSAs, and the generally more recent and preferred benchmark GSSPs (below) are defined by the International Commission on Stratigraphy (ICS) under the auspices of their parent organization, the International Union of Geological Sciences (IUGS), and are used primarily for time dating of rock layers older than 630 million years ago (Ma), before a good fossil record exists. The ICS first expends large effort to meet the standards of the GSSPs (see below) and if those fail, usually have enough information to make a preliminary selection of several competing GSSA prospects or proposals. The geologic record becomes spotty at about 542 Ma, and the ICS may well have to resort to defining additional supplementary GSSAs between the two dates. This issue is bound up in the fact that the Earth's crust in geological time scales is constantly being recycled by tectonic and weathering forces, and older rocks and especially readily accessible exposed strata (see the section about selecting the ideal GSSP, in the next link) that can act as a time calibration For more recent periods, a Global Boundary Stratotype Section and Point (GSSP), largely based on research progress in geobiology and improved methods of fossil dating, is used to define such boundaries. In contrast to GSSAs, GSSPs are based on important events and transitions within a particular stratigraphic section. In older sections, there is insufficient fossil record or well preserved sections to identify the key events necessary for a GSSP, so GSSAs are defined based on fixed dates and selected criteria.".
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- Global_Standard_Stratigraphic_Age wikiPageExternalLink displayAbstract?fromPage=online&aid=74669.
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- Global_Standard_Stratigraphic_Age wikiPageExternalLink etyindex.html.
- Global_Standard_Stratigraphic_Age wikiPageExternalLink geotime.htm.
- Global_Standard_Stratigraphic_Age wikiPageExternalLink cheu.pdf.
- Global_Standard_Stratigraphic_Age wikiPageExternalLink gssp.htm.
- Global_Standard_Stratigraphic_Age wikiPageExternalLink over.htm.
- Global_Standard_Stratigraphic_Age wikiPageExternalLink timeform.html.
- Global_Standard_Stratigraphic_Age wikiPageExternalLink gtime1.html.
- Global_Standard_Stratigraphic_Age wikiPageID "1786604".
- Global_Standard_Stratigraphic_Age wikiPageRevisionID "500374967".
- Global_Standard_Stratigraphic_Age hasPhotoCollection Global_Standard_Stratigraphic_Age.
- Global_Standard_Stratigraphic_Age subject Category:Earth_sciences.
- Global_Standard_Stratigraphic_Age subject Category:Geochronology.
- Global_Standard_Stratigraphic_Age subject Category:Geologic_time_scale.
- Global_Standard_Stratigraphic_Age subject Category:Geology_timelines.
- Global_Standard_Stratigraphic_Age subject Category:Historical_geology.
- Global_Standard_Stratigraphic_Age subject Category:Paleobiology.
- Global_Standard_Stratigraphic_Age subject Category:Paleogeography.
- Global_Standard_Stratigraphic_Age subject Category:Stratigraphy.
- Global_Standard_Stratigraphic_Age subject Category:Units_of_time.
- Global_Standard_Stratigraphic_Age type Abstraction100002137.
- Global_Standard_Stratigraphic_Age type Chronology106503224.
- Global_Standard_Stratigraphic_Age type Communication100033020.
- Global_Standard_Stratigraphic_Age type Evidence106643408.
- Global_Standard_Stratigraphic_Age type GeologyTimelines.
- Global_Standard_Stratigraphic_Age type Indication106797169.
- Global_Standard_Stratigraphic_Age type Measure100033615.
- Global_Standard_Stratigraphic_Age type Record106647206.
- Global_Standard_Stratigraphic_Age type TimeUnit115154774.
- Global_Standard_Stratigraphic_Age type Timeline106504965.
- Global_Standard_Stratigraphic_Age type UnitsOfTime.
- Global_Standard_Stratigraphic_Age type WrittenRecord106502378.
- Global_Standard_Stratigraphic_Age comment "In the stratigraphy sub-discipline of geology, a Global Standard Stratigraphic Age, officially abbreviated GSSA, is a chronological reference point and criterion in the world's rock records used to define the boundaries (an internationally sanctioned benchmark point) between different geological periods, epochs or ages on the overall geologic time scale in a chronostratigraphically useful rock layer.".
- Global_Standard_Stratigraphic_Age label "Global Standard Stratigraphic Age".
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