Ludlow epoch
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.
| Ludlow | |
|---|---|
| 427.4 ± 0.5 – 423.0 ± 2.3 Ma | |
| Chronology | |
Epochs in the Silurian -444 — – -442 — – -440 — – -438 — – -436 — – -434 — – -432 — – -430 — – -428 — – -426 — – -424 — – -422 — – -420 — – -418 — Epochs of the Silurian Period. Axis scale: millions of years ago. | |
| Etymology | |
| Name formality | Formal |
| Name ratified | 1980[3] |
| 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. 52.3592°N 2.7772°W |
| GSSP ratified | 1980[3] |
| Upper boundary definition | FAD of the Graptolite Monograptus parultimus. |
| Upper boundary GSSP | Požáry Section, Řeporyje District, Prague, Czechia 50.0277°N 14.3249°E |
| GSSP ratified | 1984[4][5] |
The Ludlow epoch is subdivided into two stages: Gorstian and Ludfordian.
Paleontology
Arthropods
| Arthropods of the Ludlow | ||||
|---|---|---|---|---|
| Taxa | Presence | Location | Description | Images |
| Arctinurus | Wenlock epoch to Ludlow epoch | Europe and North America | Large (up to 30 centimetres (12 in)) trilobite |  |
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.
- Holland, C. (1982). "The State of Silurian Stratigraphy" (PDF). Episodes. 1982: 21–23. Retrieved 11 December 2020.
- Lucas, Sepncer (6 November 2018). "The GSSP Method of Chronostratigraphy: A Critical Review". Frontiers in Earth Science. doi:10.3389/feart.2018.00191. Retrieved 11 December 2020.
- Holland, C. (June 1985). "Series and Stages of the Silurian System" (PDF). Episodes. 8: 101–103. doi:10.18814/epiiugs/1985/v8i2/005. Retrieved 11 December 2020.
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