|WikiProject Geology / Periods||(Rated B-class, Top-importance)|
|WikiProject Palaeontology||(Rated B-class, High-importance)|
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)
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)
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.
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)
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 188.8.131.52 (talk) 07:14, 2 June 2015 (UTC)
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)...
- Biogenic aragonite, like that composing the shells of most mollusks... -> Biogenic calcium carbonate, like that composing the shells of most mollusks...
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.
- 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.
- Insert footnote text here