Homerian
| Homerian | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | ||||||||||||
| 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 430.6 ± 1.3 Ma and 426.7 ± 1.5 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.
References
- ^ Jeppsson, Lennart; Calner, Mikael (June 2002). "The Silurian Mulde Event and a scenario for secundo—secundo events". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 93 (2): 135–154. doi:10.1017/S0263593300000377. eISSN 1755-6929. ISSN 1755-6910. LCCN 2007237265. OCLC 184982680. S2CID 129308139.
- ^ Munnecke, Axel; Samtleben, Christian; Bickert, Torsten (June 5, 2003). "The Ireviken Event in the lower Silurian of Gotland, Sweden-relation to similar Palaeozoic and Proterozoic events". Palaeogeography, Palaeoclimatology, Palaeoecology. 195 (1–2): 99–124. Bibcode:2003PPP...195...99M. doi:10.1016/S0031-0182(03)00304-3. eISSN 1872-616X. ISSN 0031-0182. LCCN 65009956. OCLC 1761774. S2CID 129353726. Retrieved December 12, 2025.
- ^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. December 2024. Retrieved October 23, 2025.
- ^ a b c Holland, C. (1982). "The State of Silurian Stratigraphy" (PDF). Episodes. 1982: 21–23. Retrieved 11 December 2020.
- ^ Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004). A Geologic Time Scale 2004. ISBN 9780521786737.