GSSP nomenclature

GSSP (Global Boundary Stratotype Section and Point) is a standardized reference point used by scientists to mark the official boundary between different geological time periods or epochs. It is typically defined at a specific location and stratigraphic layer (such as a rock formation) where key indicators—like fossils, chemical signatures, or mineral changes—are found. This precise marker helps geologists worldwide synchronize their understanding of Earth's history, ensuring consistent and accurate dating of rocks and events across different regions. Essentially, GSSPs serve as universally recognized "gold standards" for defining significant boundaries in Earth's geological timeline.