Global Stratotype Section and Point (GSSP)

A Global Stratotype Section and Point (GSSP) is a specific, well-defined marker in the Earth's rock record that scientists use to precisely identify the boundary between different geological periods or epochs. Usually located in a particular section of rock, the GSSP is chosen because it contains unique fossils or chemical signatures that signal a significant point in Earth's history, such as the start of a new era. This standardization helps geologists worldwide communicate clearly about Earth's timeline and evolutionary events.