Homerian | |||||||||||||
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Chronology | |||||||||||||
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Etymology | |||||||||||||
Name formality | Formal | ||||||||||||
Name ratified | 1980[4] | ||||||||||||
Usage information | |||||||||||||
Celestial body | Earth | ||||||||||||
Regional usage | Global (ICS) | ||||||||||||
Time scale(s) used | ICS Time Scale | ||||||||||||
Definition | |||||||||||||
Chronological unit | Age | ||||||||||||
Stratigraphic unit | Stage | ||||||||||||
Time span formality | Formal | ||||||||||||
Lower boundary definition | FAD of the graptolite Cyrtograptus lundgreni | ||||||||||||
Lower boundary GSSP | Sheinton Brook, Homer, England 52°36′56″N 2°33′53″W / 52.6156°N 2.5647°W | ||||||||||||
Lower GSSP ratified | 1980[4] | ||||||||||||
Upper boundary definition | FAD of the graptolite Saetograptus (Colonograptus) varians | ||||||||||||
Upper boundary GSSP | Pitch Coppice, Ludlow, U.K. 52°21′33″N 2°46′38″W / 52.3592°N 2.7772°W | ||||||||||||
Upper GSSP ratified | 1980[4] |
In the geologic timescale, the Homerian is an age of the Wenlock Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon that is comprehended between 430.5 ± 0.7 Ma and 427.4 ± 0.5 Ma (million years ago), approximately. The Homerian Age succeeds the Sheinwoodian Age and precedes the Gorstian Age.
The name comes from the small village of Homer, Shropshire near Much Wenlock.[5] The defining lower boundary of Homerian rock layers (GSSP) is located within the Coalbrookdale Formation of England.