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A 'Global Boundary Stratotype Section and Point', abbreviated 'GSSP', is an internationally agreed upon stratigraphic section which serves as the reference section for a particular boundary on the geologic time scale. The effort to define GSSPs is conducted by the International Commission on Stratigraphy, a part of the International Union of Geological Sciences. Most, but not all, GSSPs are based on paleontological changes. Hence GSSPs are usually described in terms of transitions between different faunal stages, though far more faunal stages have been described than GSSPs. The GSSP definition effort commenced in 1977. As of 2004, 45 of the 96 GSSPs required have been approved.
An ideal GSSP would

★ be accessible by public transit from a major airport

★ be accessible to research

★ be extensive enough to ensure future access

★ be easily related to other exposures worldwide

★ contain a radiometrically datable bed at the boundary, and

★ include well defined markers at the stage boundary that can be applied worldwide.
No GSSP is ideal.

Contents

Agreed-upon GSSPs

GSSAs

See also:

External links

References

Agreed-upon GSSPs

Main articles: List of Global Boundary Stratotype Sections and Points

The Precambrian-Cambrian boundary GSSP at Fortune Head, Newfoundland is a typical GSSP. It is accessible by paved road and is set aside as a nature preserve. A continuous section is available from beds that are clearly Precambrian into beds that are clearly Cambrian. The boundary is set at the first appearance of a complex trace fossil ''Trichophycus pedum'' that is found worldwide. The Fortune Head GSSP is unlikely to be washed away or built over. ''Trichophycus pedum'' is less than ideal as a marker fossil as it is not found in every Cambrian sequence, and it is not assured that it is found at the same level in every exposure. Further, it has since been identified in strata 4m ''below'' the GSSP!^[1]
However, no other fossil is known that would be preferable. There is no radiometrically datable bed at the boundary at Fortune Head, but there is one slightly above the boundary in similar beds nearby.
These factors have lead some geologists to suggest that this GSSP is in need of re-assigning.
Once a GSSP boundary has been agreed upon, a "golden spike" is driven into the geologic section to mark the precise boundary for future geologists (though in practice the "spike" need neither be golden nor an actual spike). The first stratigraphic boundary was defined in 1977 by identifying the Silurian-Devonian boundary with a bronze plaque at a locality called Klonk, northeast of the village of Suchomastyin in the Czech Republic. GSSPs are also sometimes referred to as 'Golden Spikes'.

GSSAs

Because defining a GSSP depends on finding well-preserved geologic sections and identifying key events, this task becomes more difficult as one goes farther back in time. Before 630 million years ago, boundaries on the geologic timescale are defined simply by reference to fixed dates, known as Global Standard Stratigraphic Ages.

See also:

★ Type locality

External links

★ The Global Boundary Stratotype Section and Point (GSSP): overview

References

★

★ Hedberg, H.D., (editor), ''International stratigraphic guide: A guide to stratigraphic classification, terminology, and procedure'', New York, John Wiley and Sons, 1976