Talk:Ordovician

Ma vs. mya
In these era pages I have seen "million years ago" abbreviated as Ma and as mya. Which one is the standard?
 * If the Mya (unit) article is to be believed, Ma has replaced the older Mya in scientific literature. Because of that I think we should use only Ma.--Jyril 20:23, 26 February 2006 (UTC)


 * There should be an agreed on convention regarding this notation somewhere, as I know it's been brought up before. I'd like to know as well, so if I find it, I'll leave a note here. --DanielCD 22:08, 26 February 2006 (UTC)


 * Ma is certainly the standard in professional geologic circles. Cheers Geologyguy 23:54, 10 March 2007 (UTC)


 * I vote we go with that then. --DanielCD 01:46, 11 March 2007 (UTC)

Adaptive radiation
Added information on Ordovician adaptive radiation.Erimus 23:11, 10 March 2007 (UTC)

Ordovician

Volcanic eruption
Notable enough? --Artman40 (talk) 12:08, 26 March 2009 (UTC)

Questions
Is it OK to start a questions tab here? Bill Newbold (talk) 14:24, 16 September 2009 (UTC)

Are there any more details that we know?

How classifiable and reliable are the descriptions from this time?

Needs Separate Pages
Lower or Early Ordovician, Middle Ordovician, and Upper or Late Ordovician each could well have a page of its own covering the respective science including paleontology. General historic and summary information could be retained in a general article titled simply Ordovician. Biota sections in the Arenig/Floian page could sensibly be transferred to "Ordovician" or to a specific page covering that particular taxon.J.H.McDonnell (talk) 01:48, 10 November 2009 (UTC)

Capital P?
Shouldnt it be spelled Ordovician Period rather than Ordovician period? —Preceding unsigned comment added by 130.238.7.35 (talk) 14:47, 12 November 2009 (UTC)

CO2 levels 440 Ma
Could someone with access please check these papers out, with a view to reducing the stated CO2 level before the late Ordovician glaciation to 3000ppm? I found them being referenced here; http://www.skepticalscience.com/CO2-levels-during-the-late-Ordovician.html but dont want to change the wiki without reading the papers.

http://geology.gsapubs.org/content/37/10/951.abstract

Did changes in atmospheric CO2 coincide with latest Ordovician glacial-interglacial cycles?

According to new research the CO2 level did not correspond to the temperatur at this period of time. See link http://ff.org/centers/csspp/library/co2weekly/2005-08-18/dioxide_files/image002.gif —Preceding unsigned comment added by Chriscross72 (talk • contribs) 08:32, 15 July 2010 (UTC)

cheers. --Littlerobbergirl (talk) 01:20, 13 March 2010 (UTC)

In the upper right table of the Wikipedia page on the Ordovician, the end of the Ordovician should be changed from 443.4 to 443.8 according to the 2015 Geologic Time Scale published by the ICS (http://www.stratigraphy.org/ICSchartChronostratChart2015-01.pdf). — Preceding unsigned comment added by 212.50.248.2 (talk) 07:14, 2 June 2015 (UTC)

C/E Notes
These edits actually changed the meanings intended and I've reverted to the previous terms used:


 * ... is a geologic period and system... -> ...is a geologic period (system)...
 * A geologic period is not a system. Though the latter is what delineates the former (and thus have the same names); the former is a specific measure of a length of time within Earth's history (geochronology), while the latter is a specific series of rock layers (chronostratigraphy).


 * Biogenic aragonite, like that composing the shells of most mollusks... -> Biogenic calcium carbonate, like that composing the shells of most mollusks...
 * Aragonite is not synonymous to calcium carbonate. It is a specific type of crystal of calcium carbonate (the other two being calcite and vaterite). Notice how the paragraph differentiates inorganic calcite with biogenic aragonite.

Restored these sentences for clarity:
 * Life continued to flourish during the Ordovician as it did in the Cambrian, although the end of the period...
 * The wording of your new sentence makes it confusing as to whether you are referring to the end of the Ordovician or the Cambrian.


 * Gondwana started the period in equatorial latitudes and, as the period progressed, drifted toward the South Pole.
 * The new wording makes it seem like Gondwana spontaneously appeared in the equatorial latitudes.


 * ...for ~30 million years leading up to the Hirnantian glaciation.
 * It culminated with the Hirnantian glaciation, i.e. it happened from the Dapingian to the Katian stages, not within Hirnantian proper (which only lasted for ~2 million years).


 * But over time, the climate became cooler, and around 460 million...
 * New wording implies the cooling happened at the start of the Ordovician, instead of happening during the Ordovician.

-- O BSIDIAN  †  S OUL  16:59, 18 September 2016 (UTC)

Succinct abbreviation
geologic period and system = geoperiosystem — Preceding unsigned comment added by 2A02:2149:8409:B00:2175:F455:1730:158E (talk) 08:04, 29 November 2017 (UTC)

External links modified (January 2018)
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Reference problem "Stanley1999"
Refname "Stanley1999" is defined both as "" and as "", and is then called twice more with no means to decide which of the two definitions is intended. DuncanHill (talk) 12:21, 10 May 2019 (UTC)
 * After perlustration of the page history to find out when these references were added, I've done an edit to distinguish between the two references. Jo-Jo Eumerus (talk, contributions) 14:19, 10 May 2019 (UTC)

Reliable sources needed for infobox data
The infobox makes statements about Ordovician and  concentrations and temperature that are not supported by reliable sources. This needs fixing. Plant surfer 11:11, 30 June 2019 (UTC)

Geologic ages
Where does the Ordovician start age of 485 Ma come from? The Ogg et al. 2004 linked timescale gives an Ordovician start date of 488.3 Ma, which is similar to 489 +/- 0.6 Ma from Landing et al. (2000). Both of these numbers are substantially older than 485 Ma. — Preceding unsigned comment added by Cwmagee (talk • contribs) 05:29, 2 March 2022 (UTC)

In the news
From one of my sources - One of the world’s greatest fossil finds made in Wales (msn.com) Can someone with 'proper geological knowledge' (being at 'popular geology level myself) investigate further. Jackiespeel (talk) 20:00, 1 May 2023 (UTC)

Should we have sections for the British stages ?
Yes why?, Why can't we just have, well,... an article for them? even a section of the article is fine. here's what I Think should be there.

Ashgill
The Ashgill Epoch, The First epoch of the British Ordovician Epochs, is made of 4 Ages which are: The Hirnantian Age, The Rawtheyan Age, The Cautleyan Age, and The Pusgillian Age. These ages make up the time period from 458 Mya to ~444 Mya.

Hirnantian
See:Hirnantian

Rawtheyan
The Rawtheyan, The 2nd latest of the Ashgill Ages, was from 446.5 Mya to 445.6 Mya. It is in the Katian Age of the ICS Ordovician Ages.

Cressagian
The Cressagian, 1. https://timescalefoundation.org/resources/geowhen/stages/Rawtheyan.html Edmoral000 (talk) 14:24, 21 May 2024 (UTC) (This is Unfinished)