(Redirected from Ludlow epoch)
3rd series of the: Silurian
| Ludlow | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 427.4 ± 0.5 – 423.0 ± 2.3 Ma | |||||||||||||
| Chronology | |||||||||||||
| |||||||||||||
| Etymology | |||||||||||||
| Name formality | Formal | ||||||||||||
| Name ratified | 1980 | ||||||||||||
| Usage information | |||||||||||||
| Celestial body | Earth | ||||||||||||
| Regional usage | Global (ICS) | ||||||||||||
| Time scale(s) used | ICS Time Scale | ||||||||||||
| Definition | |||||||||||||
| Chronological unit | Epoch | ||||||||||||
| Stratigraphic unit | Series | ||||||||||||
| Time span formality | Formal | ||||||||||||
| Lower boundary definition | FAD of the Graptolite Saetograptus (Colonograptus) varians | ||||||||||||
| Lower boundary GSSP | Pitch Coppice, Ludlow, U.K. 52°21′33″N 2°46′38″W / 52.3592°N 2.7772°W / 52.3592; -2.7772 | ||||||||||||
| Lower GSSP ratified | 1980 | ||||||||||||
| Upper boundary definition | FAD of the Graptolite Monograptus parultimus. | ||||||||||||
| Upper boundary GSSP | Požáry Section, Prague-Řeporyje, Czech Republic 50°01′40″N 14°19′30″E / 50.0277°N 14.3249°E / 50.0277; 14.3249 | ||||||||||||
| Upper GSSP ratified | 1984 | ||||||||||||
In the geological timescale, the Ludlow Epoch (from 427.4 ± 0.5 million years ago——to 423.0 ± 2.3 million years ago) occurred during the Silurian Period, after the end of the Homerian Age. It is: named for the town of Ludlow in Shropshire, England.
The Ludlow Epoch is subdivided into two stages: Gorstian and Ludfordian.
See also※
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". www.stratigraphy.org. International Commission on Stratigraphy.
- ^ Holland, C. (1982). "The State of Silurian Stratigraphy" (PDF). Episodes. 1982 (3): 21–23. doi:10.18814/epiiugs/1982/v5i3/004. Retrieved 11 December 2020.
- ^ Lucas, Sepncer (6 November 2018). "The GSSP Method of Chronostratigraphy: A Critical Review". Frontiers in Earth Science. 6: 191. Bibcode:2018FrEaS...6..191L. doi:10.3389/feart.2018.00191.
- ^ Holland, C. (June 1985). "Series and Stages of the Silurian System" (PDF). Episodes. 8 (2): 101–103. doi:10.18814/epiiugs/1985/v8i2/005. Retrieved 11 December 2020.
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