In the geological timescale, the Ludlow Epoch or Mid-Late Silurian (from 426.7 ± 1.5 million years ago to 422.7 ± 1.6 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.
| Ludlow | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
.png) A map of Earth as it appeared 425 million years ago during the Ludlow Epoch, Ludfordian Age | |||||||||||||
| 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 | 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 | ||||||||||||
| Lower GSSP ratified | 1980[4] | ||||||||||||
| 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 | ||||||||||||
| Upper GSSP ratified | 1984[5][6] | ||||||||||||
The Ludlow Epoch is subdivided into two stages: Gorstian and Ludfordian.
See also
editReferences
edit- ↑ 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.
- 1 2 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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