Roadian

Short description: Fifth stage of the Permian

Roadian

273.01 ± 0.14 – 266.9 ± 0.4 Ma

PreЄ

Chronology

Permian graphical timeline

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Gzhelian

Asselian

Sakmarian

Artinskian

Kungurian

Roadian

Wordian

Capitanian

Wuchiapingian

Changhsingian

Induan

Permian-Triassic mass extinction event

end-Capitanian extinction event

Olson's Extinction

Subdivision of the Permian according to the ICS, as of 2021.[1]
Vertical axis scale: millions of years ago.

Etymology
Name formality| Formal
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 Conodont Jinogondolella nanginkensis
Lower boundary GSSP| Stratotype Canyon, Guadalupe Mountains, Texas , United States
[ ⚑ ] 31°52′36″N 104°52′36″W﻿ / ﻿31.8767°N 104.8768°W﻿ / 31.8767; -104.8768
GSSP ratified| 2001[2]
Upper boundary definition| FAD of the Conodont Jinogondolella aserrata
Upper boundary GSSP| Guadalupe Pass, Guadalupe Mountains, Texas, USA
[ ⚑ ] 31°51′57″N 104°49′58″W﻿ / ﻿31.8658°N 104.8328°W﻿ / 31.8658; -104.8328
GSSP ratified| 2001[2]
Hercosestria cribrosa, A reef-forming Roadian brachiopod from the Glass Mountains of Texas .

In the geologic timescale, the Roadian is an age or stage of the Permian. It is the earliest or lower of three subdivisions of the Guadalupian Epoch or Series. The Roadian lasted between 272.95 and 268.8 million years ago (Ma). It was preceded by the Kungurian and followed by the Wordian.[3]

## Contents

* 1 Stratigraphy
* 2 Roadian life
* 3 Notable formations
* 4 References
* 4.1 Literature
* 5 External links

## Stratigraphy

In 1961, the regional timescale used for the southeastern US had the Wordian and Capitanian as subdivisions of the Guadalupian.[4] Efforts to correlate the Permian stratigraphy of the southeastern US with that of Russia led to the conclusion that between the Wordian stage and the Russian Artinskian stage, another stage needed to be introduced.[5] This stage, the Roadian Stage, was established in 1968 and took its name from the Road Canyon Formation in Brewster County, Texas , formerly considered the lower (oldest) part of the Word Formation.[6] The stage was added to the internationally used IUGS timescale in 2001.[7]

The base of the Roadian is defined as the place in the stratigraphic record where fossils of conodont species Jinogondolella nankingensis first appears. The global reference profile for the base (the GSSP) is located in Stratotype Canyon in the Guadalupe Mountains, Texas ( [ ⚑ ] 31°52′36″N 104°52′36″W﻿ / ﻿31.87667°N 104.87667°W﻿ / 31.87667; -104.87667). The top of the Roadian (the base of the Wordian Stage) is at the first appearance of fossils of conodont species Jinogondolella aserrata.

## Roadian life

Olson’s Extinction, a worldwide loss of terrestrial vertebrate life occurred during the Early Guadalupian (Roadian, Wordian).[8]

## Notable formations

* Cherry Canyon Formation (New Mexico, Texas , USA)
* Road Canyon Formation (Taxas, USA)

## References

1. ↑ "Chart/Time Scale". International Commission on Stratigraphy. http://www.stratigraphy.org/index.php/ics-chart-timescale.
2. ↑ 2.0 2.1 "GSSP for Roadian Stage". https://stratigraphy.org/gssps/roadian.
3. ↑ Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press
4. ↑ Glenister, B.F. & Furnish, W.M.; 1961: The Permian ammonoids of Australia, Journal of Paleontology 35(4), pp 673–736.
5. ↑ Nassichuk, W.W.; 1964: Pennsylvanian and Permian rocks in the Parry Islands Group, Canadian Arctic Archipelago, Report of activities, field
6. ↑ Furnish & Glenister (1968)
7. ↑ Glenister, B.F.; Wardlaw, B.R.; Lambert, L.L.; Spinosa, C.; Bowring, S.A.; Erwin, D.H.; Menning, M. & Wilde, G.L.; 1999: Proposal of Guadalupian and Component Roadian, Wordian and Capitanian Stages as International Standards for the Middle Permian Series, Permophiles 34: pp 3–11.
8. ↑ Sahney, S.; Benton, M.J. (2008). "Recovery from the most profound mass extinction of all time". Proceedings of the Royal Society B: Biological Sciences 275 (1636): 759–65. doi:10.1098/rspb.2007.1370. PMID 18198148.

### Literature

## External links

* GeoWhen Database - Roadian
* Upper Paleozoic stratigraphic chart at the website of the subcommission for stratigraphic information of the ICS

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Geological history of Earth

Cenozoic era
(present–66.0 Mya)|

| Quaternary (present–2.588 Mya)|

* Holocene (present–11.784 kya)
* Pleistocene (11.784 kya–2.588 Mya)

|

Neogene (2.588–23.03 Mya)|

* Pliocene (2.588–5.333 Mya)
* Miocene (5.333–23.03 Mya)

Paleogene (23.03–66.0 Mya)|

* Oligocene (23.03–33.9 Mya)
* Eocene (33.9–56.0 Mya)
* Paleocene (56.0–66.0 Mya)

Mesozoic era
(66.0–251.902 Mya)|

| Cretaceous (66.0–145.0 Mya)|

* Late (66.0–100.5 Mya)
* Early (100.5–145.0 Mya)

|

Jurassic (145.0–201.3 Mya)|

* Late (145.0–163.5 Mya)
* Middle (163.5–174.1 Mya)
* Early (174.1–201.3 Mya)

Triassic (201.3–251.902 Mya)|

* Late (201.3–237 Mya)
* Middle (237–247.2 Mya)
* Early (247.2–251.902 Mya)

Paleozoic era
(251.902–541.0 Mya)|

| Permian (251.902–298.9 Mya)|

* Lopingian (251.902–259.8 Mya)
* Guadalupian (259.8–272.3 Mya)
* Cisuralian (272.3–298.9 Mya)

|

Carboniferous (298.9–358.9 Mya)|

* Pennsylvanian (298.9–323.2 Mya)
* Mississippian (323.2–358.9 Mya)

Devonian (358.9–419.2 Mya)|

* Late (358.9–382.7 Mya)
* Middle (382.7–393.3 Mya)
* Early (393.3–419.2 Mya)

Silurian (419.2–443.8 Mya)|

* Pridoli (419.2–423.0 Mya)
* Ludlow (423.0–427.4 Mya)
* Wenlock (427.4–433.4 Mya)
* Llandovery (433.4–443.8 Mya)

Ordovician (443.8–485.4 Mya)|

* Late (443.8–458.4 Mya)
* Middle (458.4–470.0 Mya)
* Early (470.0–485.4 Mya)

Cambrian (485.4–541.0 Mya)|

* Furongian (485.4–497 Mya)
* Miaolingian (497–509 Mya)
* Series 2 (509–521 Mya)
* Terreneuvian (521–541.0 Mya)

Proterozoic eon
(541.0 Mya–2.5 Gya)|

| Neoproterozoic (541.0 Mya–1 Gya)|

* Ediacaran (541.0–~635 Mya)
* Cryogenian (~635–~720 Mya)
* Tonian (~720 Mya–1 Gya)

|

Mesoproterozoic (1–1.6 Gya)|

* Stenian (1–1.2 Gya)
* Ectasian (1.2–1.4 Gya)
* Calymmian (1.4–1.6 Gya)

Paleoproterozoic (1.6–2.5 Gya)|

* Statherian (1.6–1.8 Gya)
* Orosirian (1.8–2.05 Gya)
* Rhyacian (2.05–2.3 Gya)
* Siderian (2.3–2.5 Gya)

Archean eon (2.5–4 Gya)|

| Eras|

* Neoarchean (2.5–2.8 Gya)
* Mesoarchean (2.8–3.2 Gya)
* Paleoarchean (3.2–3.6 Gya)
* Eoarchean (3.6–4 Gya)

|

Hadean eon (4–4.6 Gya)|

|  |

|

kya = thousands years ago. Mya = millions years ago. Gya = billions years ago.
See also: Geologic time scale

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