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The
Climate section's text speaks of two glaciations (Sturtian and Marinoan) whereas the graphic shows 3 glaciations (Kaigas being the third), and the Sturtian dates disagree (720 to 700 million years ago in the graphic, 750 to 700 million years ago in the text, which thus overlaps the Kaigas in the
796:
Hi
Tlhslobus! Thank you for bringing attention to this problem. I moved the Kaigas glaciation to the notes. According to the sources I could find it is a really enigmatic glaciation. Duration and global extent are still very uncertain. It also seems that the duration that was given in the template
965:
The youngest, Gaskiers has been placed in the
Ediacarian. They wanted the two biggest and most important glaciations to constitute the Cryogenian, so they proposed a new GSSP for the base of the Cryogenian to be placed between the end of the Kaigas and the beginning of the Sturtian. Including the
426:
I think we need a massive rewrite of this article: It's one of the most layman-unfriendly articles I've seen, not only failing to explain terms, but often using an obscure geological term where a perfectly good common-language term is available, such as use of Ma for dates, "tillage" for glacial
399:- There is a table with a time-scale. I'm guessing they are terms used locally to define when those formations where depositied. The younger Marinoan event occured at the end of the Cyrogenian, by definition, as the overlying Nuccaleena formation dolomite defines the start of the Edicaran.
737:
Thanks for sorting this but there is still a problem which I do not understand. There is now a duplicate references heading on the right. (I have moved entries in references which belonged in further reading but this did not make any difference.)
313:
The carbon analysis here isn't C-14 decay, actually, it's calculating the concentrations of stable C-13 in sediments. The more carbon that's locked away in sediments means that there's fewer greenhouse gases left to warm the atmosphere.
713:
I've fixed it by splitting the intro into the intro and a second section and forcing a table of contents in between. I called it "ratification" because that was the first key word I saw, so there is probably something better to call
921:
Additional remark: "The
Sturtian glaciation persisted from 750 to 700 million years ago." The graph on the right hand side shows the Sturtian lasting from 720 to 660 million years ago. I detect a contradiction there.
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Kaigas (poorly constrained to between 770 and 735 Ma) Sturtian (well constrained to c. 715 - 680 Ma) Marinoan (well constrained to 660 - c. 635 Ma) Gaskiers (extremely well constrained to c. 585 - c. 582 Ma)
589:
And shouldnt the end be at the start of the
Ediacaran at ~635 Ma rather than 630? Although there is no exact dating on the Australian succession it is more correct to say 635 than 630 Ma. I will change it.
448:
I have made a pass over both paragraphs. I think the geological terms are fine since it's an article on geology, but have tried to give some contextual cues and to streamline the sentence structure. --
878:
there is no information about the copyright of the map. Do a google image search and see if you can find where this came from. The chances are that we will need a redrawn map so as to be free.
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previously was not the duration of the glaciation, but the estimated time interval in which the glaciation is thought to have happened. I will try to fix the text as soon as possible. --
839:
Not an expert on the subject but there is no doubt that these ice ages happened. I think the degree of glaciation is controversial. Maybe the wording should be changed to this. --
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Me being hyperprecize: the carbon analysis is balance, natural isotopic balance implying inorganic origin, deviation from natural implying organic origin. Organic origin implies
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863:. However I need someone (or an admin) to get this image displayed as it is the only valid paleogeography image during the Cryogenian period.
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On the same subject i don't know if everyone knows what "circa" means... I don't think Latin expressions would help anyone...
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There is an error which I cannot sort out which puts the contents in the wrong place. Can an expert deal with this?
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I am trying alot of ways to get an image of
Rodinia during the Cryogenian period. The only one I found was this:
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Kaigas would have been difficult because it is so poorly constrained and probably not even global in extant.
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The following
Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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be important to include in this article, since it states one of the possible causes of glaciations? --
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https://web.archive.org/web/20140530005940/http://www.stratigraphy.org/index.php/ics-chart-timescale
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However, carbon isotope analysis indicates that several worldwide glaciations may have occurred.
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18:43, 22 Sep 2004 (UTC)) I've merged this with
Varanger glac. In the course of that I removed:
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resource. If you would like to participate, you can choose to edit this article, or visit the
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I agree but this appears to be a poorly designed template which I cannot see how to amend.
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The term
Varanger is now depreciated. It referred to any or all of the glaciations in the
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linking to that page which explains why it needs to be used on that page. Please check
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I've had a go at the first paragraph, but am not really sure what to do after that....
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If you found an error with any archives or the URLs themselves, you can fix them with
641:, sponge fossils have found in Cryogenian period. When we can add that information? --
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A Commons file used on this page or its
Wikidata item has been nominated for deletion
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Age constraints on Precambrian glaciations and the subdivision of Neoproterozoic time
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when used here. In particular, for each page the image is used on, it must have an
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graphic). As an ignorant layman, I don't feel competent to try to fix any of this.
331:, inorganic origin may imply glaciation or some other harsh conditions for life.
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896:. But do I have to upload it to Wikimedia in order to get it uploaded here? --
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As much as I've experienced, there seem to be no scientific consensus to what
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These 'snowball earth' events are the subject of much scientific controversy
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referring to a short glaciation around ~570 Ma, which was otherwise called
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Lifeforms in Cryogenian, Subdivisions of Cryogenian, Nonglacial periods.
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Is this the best way to word it? I'd prefer "9 ºC below modern level".
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An editor has reviewed this edit and fixed any errors that were found.
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Hey, this whole sponge-origin thing is really quite hazy, you know?
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I think these link are deads. In 2015, ICS updated to 720 Mya, See
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That this article is linked to from the image description page.
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When you have finished reviewing my changes, please set the
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on the image's description page for the use in this article.
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http://www.stratigraphy.org/geowhen/stages/Cryogenian.html
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for additional information. I made the following changes:
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http://www.stratigraphy.org/index.php/ics-chart-timescale
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Image copyright problem with Image:SnowballGeography.gif
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a template transcluded onto the page. I've fixed that.
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958:" there were four glaciations during the Cryogenian.
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I just added the sponge fossils to the template. --
914:Cryogenian's base changed from 850 Mya to 720 Mya
306:Carbon dating doesn't go back the far. I think.
1156:Participate in the deletion discussion at the
576:. For assistance on the image use policy, see
918:Can anyone explain why the ICS changed this?
8:
494:Subcommission on Neoproterozoic Stratigraphy
1194:Mid-importance Start-Class Geology articles
892:As I said, the page I got it from is this:
776:Mismatches between graphic and Climate text
496:of ICS says 750 million years ago, in it's
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1204:Mid-importance Geological periods articles
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249:Here are some tasks awaiting attention:
47:
1001:I have just modified 2 external links on
578:Knowledge (XXG):Media copyright questions
541:is used in this article under a claim of
1199:Start-Class Geological periods articles
49:
1219:Knowledge (XXG) pages with to-do lists
1107:Surface temp -9 °C above modern level
1046:to let others know (documentation at
7:
894:http://www.scotese.com/precambr.htm
861:http://www.scotese.com/precambr.htm
124:Knowledge (XXG):WikiProject Geology
38:It is of interest to the following
947:Cryogenian Base changed to 720 MYA
14:
1005:. Please take a moment to review
951:I think I have found the reason.
162:the Geological periods task force
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1:
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367:21:43, 27 December 2006 (UTC)
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322:16:51, 23 November 2006 (UTC)
159:This article is supported by
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639:According to recent research
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547:requirements for such images
513:22:54, 28 October 2007 (UTC)
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317:The Caltech link is broken.
127:Template:WikiProject Geology
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362:I may be wrong however...
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561:non-free use rationale
28:This article is rated
498:annual report of 2006
118:for more information.
32:on Knowledge (XXG)'s
824:Is this still true?
397:Adelaide Geosyncline
296:William M. Connolley
1038:parameter below to
617:Would this research
107:WikiProject Geology
1162:Community Tech bot
1151:Scotese 690 ma.png
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488:Start 850 or 750??
354:refers. I've seen
308:Radiocarbon dating
230:Updated 2009-04-05
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30:Start-class
1178:Categories
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1003:Cryogenian
975:Martin3003
841:Tobias1984
799:Tobias1984
668:Tobias1984
574:FairuseBot
537:The image
468:Sinekonata
360:Gaskier's.
342:Varanger??
290:Discussion
201:Cryogenian
197:To-do list
1080:this tool
1073:this tool
826:Viriditas
783:Tlhslobus
754:messed up
1086:Cheers.—
983:contribs
971:unsigned
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925:Martin
643:Artman40
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348:Varanger
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225:refresh
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121:Geology
112:geology
64:Periods
59:Geology
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503:Said:
450:Reuben
364:Rursus
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36:scale.
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