Homerian | |
---|---|
430.5 ± 0.7 – 427.4 ± 0.5 Ma | |
Paleogeography of the Homerian, 430 Ma | |
Chronology | |
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 |
GSSP ratified | 1980[4] |
Upper boundary definition | FAD of the graptolite Saetograptus (Colonograptus) varians |
Upper boundary GSSP | Pitch Coppice, Ludlow, United Kingdom [ ⚑ ] 52°21′33″N 2°46′38″W / 52.3592°N 2.7772°W |
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.
Original source: https://en.wikipedia.org/wiki/Homerian.
Read more |