Ludlow Epoch
| Ludlow | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | FADof theGraptoliteSaetograptus (Colonograptus) varians | ||||||||||||
| Lower boundary GSSP | Pitch Coppice,Ludlow,U.K. 52°21′33″N2°46′38″W/ 52.3592°N 2.7772°W | ||||||||||||
| Lower GSSP ratified | 1980[4] | ||||||||||||
| Upper boundary definition | FAD of the GraptoliteMonograptus parultimus. | ||||||||||||
| Upper boundary GSSP | Požáry Section,Prague-Řeporyje,Czech Republic 50°01′40″N14°19′30″E/ 50.0277°N 14.3249°E | ||||||||||||
| Upper GSSP ratified | 1984[5][6] | ||||||||||||
In thegeological timescale,theLudlow Epoch(from 427.4 ± 0.5 million years ago to 423.0 ± 2.3 million years ago) occurred during theSilurianPeriod, after the end of theHomerianAge. It is named for the town ofLudlowinShropshire,England.
The Ludlow Epoch is subdivided into two stages:GorstianandLudfordian.
See also
[edit]References
[edit]- ^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.
- ^abHolland, C. (1982)."The State of Silurian Stratigraphy"(PDF).Episodes.1982(3): 21–23.doi:10.18814/epiiugs/1982/v5i3/004.Retrieved11 December2020.
- ^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.Retrieved11 December2020.
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