Gorstian
In the geologic timescale, the Gorstian is the age of the Ludlow epoch of the Silurian period of the Paleozoic era of the Phanerozoic eon that is comprehended between 427.4 ± 0.5 Ma and 425.6 ± 0.9 Ma (million years ago), approximately. The Gorstian age succeeds the Homerian age and precedes the Ludfordian age.[4] The age is named after Gorsty village southwest of Ludlow. The base of the age is marked by Graptolites tumescens and Graptolites incipiens. The type section is located in a quarry in the Elton Formation at Pitch Coppice, Shropshire, United Kingdom.[5]
| Gorstian | |
|---|---|
| 427.4 ± 0.5 – 425.6 ± 0.9 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 | Age |
| Stratigraphic unit | Stage |
| 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 | Imprecise. Near FAD of the Graptolite Saetograptus leintwardinensis |
| Upper boundary definition candidates | None |
| Upper boundary GSSP candidate section(s) | None |
| Upper boundary GSSP | Sunnyhill, Ludlow, England 52.3592°N 2.7772°W |
| GSSP ratified | 1980[3] |
Palaeontology
Arthropods
| Arthropods of the Gorstian | ||||
|---|---|---|---|---|
| Taxa | Presence | Location | Description | Images |
| Brontoscorpio | Trimpley, Worcestershire, UK | |||
| Balizoma | 440.8 million years ago to Pridoli epoch | Dudley, England | The genus has only been found in rocks of Silurian age. | _of_the_encrinurine_trilobite_Balizoma_variolaris.jpg.webp) |
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.
- Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004). A Geologic Time Scale 2004. ISBN 9780521786737.
- Silurian System
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