Aeronian

Short description: Second stage of the Silurian

Aeronian

440.8 ± 1.2 – 438.5 ± 1.1 Ma

PreЄ

Chronology

Silurian graphical timeline

This box: view * talk * edit

-444 --

-442 --

-440 --

-438 --

-436 --

-434 --

-432 --

-430 --

-428 --

-426 --

-424 --

-422 --

-420 --

-418 --

Paleozoic

Silurian

Llandovery

95%;|Wenlock}}

90%;|Ludlow}}

Přídolí

Hirnantian

Rhuddanian

Aeronian

Telychian

Sheinwoodian

Homerian

Gorstian

Ludfordian

Lochkovian

Lau event

Mulde event[1]

Ireviken event[2]

Subdivision of the Silurian according to the ICS, as of 2021.[3]
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 graptolite Monograptus austerus sequens
Lower boundary GSSP| Trefawr Track Section, Llandovery, Wales, United Kingdom
[ ⚑ ] 52°01′48″N 3°42′00″W﻿ / ﻿52.0300°N 3.7000°W﻿ / 52.0300; -3.7000
GSSP ratified| 1984[4]
Upper boundary definition| Just above LAD of the brachiopod Eocoelia intermedia, below FAD of lowest succeeding species Eocoelia curtisi
Upper boundary GSSP| Cefn-cerig Road Section, Llandovery, Wales, UK
[ ⚑ ] 51°58′12″N 3°47′24″W﻿ / ﻿51.9700°N 3.7900°W﻿ / 51.9700; -3.7900
GSSP ratified| 1984[4]

In the geologic timescale, the Aeronian is an age of the Llandovery Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon that began 440.8 ± 1.2 Ma and ended 438.5 ± 1.1 Ma (million years ago). The Aeronian Age succeeds the Rhuddanian Age and precedes the Telychian Age, all in the same epoch.[5]

During the Aeronian the Sedgwickii Event occurred in which graptolite diversity was greatly reduced.[6] This event has been attested in locations such as today's Canada, Libya as well as in La Chilca Formation in Argentina (then part of Gondwana).[6]

## GSSP

The GSSP is located in the Trefawr Track section, 500m north of Cwm-coed-Aeron Farm, Wales, United Kingdom .[7] The GSSP lies within the gently-dipping blocky mudstones of the Trefawr Formation, which principally yield abundant and diverse shelly faunas, but also contain enough graptolites to allow recognition of several biozones.[8]

## References

1. ↑ 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.
2. ↑ 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.
3. ↑ "Chart/Time Scale". International Commission on Stratigraphy. http://www.stratigraphy.org/index.php/ics-chart-timescale.
4. ↑ 4.0 4.1 Holland, C. (June 1985). "Series and Stages of the Silurian System". Episodes 8 (2): 101–103. doi:10.18814/epiiugs/1985/v8i2/005. http://www.episodes.org/journal/view.html?volume=8&number=2&spage=101&vmd=A#1. Retrieved 15 December 2020.
5. ↑ "GSSP Table - All Periods". http://www.stratigraphy.org/GSSP/index.html.
6. ↑ 6.0 6.1 Lopez, Fernando Enrique; Kaufmann, Cintia (2023). "New insights on the Silurian graptolite biostratigraphy of the La Chilca Formation, Poblete Norte section, Central Precordillera of San Juan, Argentina: faunal replacement and paleoenvironmental implications". Andean Geology 50 (2). doi:10.5027/andgeov50n2-3617. https://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062023000200201&lng=en&nrm=iso&tlng=en.
7. ↑ Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004). A Geologic Time Scale 2004. ISBN 9780521786737.
8. ↑ "GSSP for Aeronian Stage". http://www.stratigraphy.org/GSSP/Aeronian.html.

* v
* t
* e

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

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Aeronian. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Earth:Aeronian&oldid=248365"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template