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In the stratigraphy sub-discipline of geology, a Global Standard Stratigraphic Age, abbreviated GSSA, is a chronological reference point and criterion in the geologic record 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.
The standard stratigraphic nomenclature is a chronostratigraphic system based on palaeontological intervals of time defined by recognised fossil assemblages (biostratigraphy). The aim of chronostratigraphy is to give a meaningful age date to these fossil assemblage intervals and interfaces.
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The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [3]
Subdivision of the Phanerozoic according to the ICS, as of 2023. [1] Vertical axis scale: Millions of years ago. Template documentation. Phanerozoic eon divisions ...
In addition to publishing paper and document (PDF) versions of the International Stratigraphic Chart, the ICS also provides a machine-readable version of the chart formulated using the Web Ontology Language (OWL) and, in particular, Time Ontology in OWL. The ICS' chart web page also provides an interactive version of the chart, based on the OWL ...
This technique is used to date speleothems, corals, carbonates, and fossil bones. Its range is from a few years to about 700,000 years. Potassium–argon dating and argon–argon dating. These techniques date metamorphic, igneous and volcanic rocks. They are also used to date volcanic ash layers within or overlying paleoanthropologic sites. The ...
"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. Archived from the original on 2023-11-30. "GSSPs and Continental drift 3D views". ghkclass.net. Archived from the original on 2023-12-08.