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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 reference points on stratigraphic sections of rock which define the lower boundaries of stages on the geologic time scale .
"The Global Boundary Stratotype Section and Point (GSSP): overview". stratigraphy.org. Archived from the original on 2009-01-13. "Chart of The Global Boundary Stratotype Sections and Points (GSSP): chart". stratigraphy.science.purdue.edu. Archived from the original on 2022-06-30. "GSSP Table - All Periods". timescalefoundation.org.
A Global Boundary Stratotype Section and Point (GSSP) is an internationally agreed upon reference point on a stratigraphic section which defines the lower boundaries of stages on the geologic time scale. [5] (Recently this has been used to define the base of a system) [6]
Some of these boundary points are at physical locations, while others are in ice drill core sections, or have been defined chronometrically. The GSSP for the Danian Stage marks the end of the Cretaceous and the beginning of the Paleocene Series. [10] Located in Tunisia, the contact is described as a reddish layer at the base of a dark clay layer.
A lower boundary is defined by locating a GSSP (informally known as 'golden spike') in the stratigraphic section of a stage, the chronostratigraphic taxonomic equivalent of an epoch. Alternatively, if a 'golden spike' cannot be located, a GSSA can be agreed upon, although this methodology is usually implemented for Precambrian boundaries. [19]
The Adobe Glyph List (AGL) is a mapping of 4,281 glyph names to one or more Unicode characters.Its purpose is to provide an implementation guideline for consumers of fonts (mainly software applications); it lists a variety of standard names that are given to glyphs that correspond to certain Unicode character sequences.
In geology, a stratotype or type section is the physical location or outcrop of a particular reference exposure of a stratigraphic sequence or stratigraphic boundary. If the stratigraphic unit is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is the type locality .