In the geologic timescale, the Gorstian is an age of the  Ludlow Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon that is comprehended between 427.4 ± 0.5 Ma and 425.6 ± 0.9 Ma (million years ago), approximately.
The Gorstian is a geological period that falls within the Ludlow Epoch of the Silurian Period, which is part of the Paleozoic Era and the Phanerozoic Eon. It existed between 427.4 million years ago and 425.6 million years ago.