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Which organizations oversee international Silurian boundary markers?
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Silurian Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the middle part of the Silurian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
The international Silurian boundary markers, known as Global Stratotype Sections and Points (GSSPs) or "golden spikes," are overseen by the International Commission on Stratigraphy (ICS) and its various committees and working groups. These bodies operate under the authority of the International Union of Geological Sciences (IUGS).1