Gorstian

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In the geologic timescale, the Gorstian is the age of the Ludlow epoch of the Silurian period of the Paleozoic era of the Phanerozoic eon that is comprehended between 422.9 ± 2.5 Ma and 421.3 ± 2.6 Ma (million years ago), approximately. The Gorstian age succeeds the Homerian age and precedes the Ludfordian age.

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Silurian period
Llandovery Wenlock Ludlow Pridoli
Rhuddanian | Aeronian
Telychian		 Sheinwoodian | Homerian Gorstian | Ludfordian