Earth:Homerian
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Short description: Fifth stage of the Silurian
| 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.
References
- ↑ Jeppsson, L.; Calner, M. (2007). "The Silurian Mulde Event and a scenario for secundo—secundo events". Earth and Environmental Science Transactions of the Royal Society of Edinburgh 93 (02): 135–154. doi:10.1017/S0263593300000377.
- ↑ Munnecke, A.; Samtleben, C.; Bickert, T. (2003). "The Ireviken Event in the lower Silurian of Gotland, Sweden-relation to similar Palaeozoic and Proterozoic events". Palaeogeography, Palaeoclimatology, Palaeoecology 195 (1): 99–124. doi:10.1016/S0031-0182(03)00304-3.
- ↑ "Chart/Time Scale". International Commission on Stratigraphy. http://www.stratigraphy.org/index.php/ics-chart-timescale.
- ↑ 4.0 4.1 4.2 Holland, C. (1982). "The State of Silurian Stratigraphy". Episodes 1982: 21-23. https://stratigraphy.org/gssps/files/sheinwoodian-ludfordian.pdf. Retrieved 11 December 2020.
- ↑ Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004). A Geologic Time Scale 2004. ISBN 9780521786737.
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