List of Global Boundary Stratotype Sections and Points

List Of Global Boundary Stratotype Sections And Points

List of Global Boundary Stratotype Sections and Points

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This is a list of Global Boundary Stratotype Sections and Points. Since 1977, Global Boundary Stratotype Sections and Points (abbreviated GSSPs) are internationally agreed upon stratigraphic sections of rock which serve as references for boundaries on the geologic time scale. They are selected by the International Commission on Stratigraphy based on multiple factors, but their accessibility and the degree to which they are representative of the same boundary on sections worldwide are among the most important.

Since GSSPs require well-preserved sections of rock, and since most are defined by different stages of animal life, defining them becomes progressively more difficult as one goes further back in time. With one exception,The Ediacaran period is the only Precambrian period bounded by a GSSP. The boundary is defined as the base of the Nuccaleena Formation at the Enorama Creek section of the central Flinders Ranges, Adelaide Rift Complex, Australia, which marks the beginning of an ice age 630 mya. GSSPs are limited to the Phanerozoic eon, while the Precambrian is demaracated by fixed dates which do not reflect identifiable changes in the geologic record (Global Standard Stratigraphic Ages). By 2008, all but three stages of the Phanerozoic will be bounded by GSSPs.According to the schedule prepared at the ICS meeting in Leuven, Belgium, September 2005. The three stages omitted are Two, Three, and Four of the Cambrian.

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