Talk:Gondwana
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[edit]According to my lecturer Jørgen Klein (2004) the breakup of Gondwana is as follows: 130 Ma India breakes loose. 80 Ma Africa and South America drift apart, and Australia and antarctica some later. About 30 Ma Africa connects with Eurasia.
According to the animation on the link I've inserted the breakup is like this:
160-150 Ma: the southern part of Gondwanaland starts drifting away from South America and Africa.
120 Ma: India is disconnected, Africa starts disconnecting.
100 Ma: Africa and South America disconnect, Australia and Antartica disconnect.
90 Ma: India and Madagascar disconnect.
All this conflicts with 20-60 Ma, so I'm not sure what to trust, don't have time for more research now, but maybe later. Dittaeva 12:07, 4 Feb 2004 (UTC)
Dating of geologic events is kind of variable, because dates are given + or - so many years and such. Methods are not exact; with millions of years, people usually just aim for the ball park. They should all roughly follow though. I'll look at this; I've been editing geology articles and dating is an aspect I haven't paid a lot of attention to. I start looking for inconsistencies. If you think your dates are better, by all means put 'em in. --DanielCD 22:26, 2 Dec 2004 (UTC)
I have a question. I have read about Pangea for decades. I aways assumed that it was a landmass surrounded by water. The photo shows a landmass with some sort of body of water in various places (lakes/rivers?). Then there is the grey part. Wasn't that land as well? If ocean, why not show it as an ocean? Mylittlezach (talk) —Preceding undated comment added 23:18, 19 January 2019 (UTC)
Two Gondwanas?
[edit]The present article only seems to refer to Gondwana starting in the Jurassic. However, In other articles Gondwana appears in the Cambrian period as well. Pannotia refers to Protogondwana. Can some wise person sort this out? A timeline would be helpful. The Atlantica article seems most helpful saying:
- ~Cambrian: the major supercontinent Pannotia disintegrated, leaving Atlantica in the minor supercontinent Gondwana.
- ~Permian: Gondwana, which contained Atlantica, became part of the major supercontinent Pangaea.
- ~Jurassic: Gondwana separated from Pangaea, carrying Atlantica with it.
- ~Cretaceous: Gondwana fragmented, splitting Atlantica between the modern continents of Africa and South America.
Thincat 15:53, 26 July 2005 (UTC)
- User:Jmeert has now done this. Thincat 15:29, 6 March 2006 (UTC)
The article Proto-Gondwana clarifies the point: before Merging into Pangaea (proto gondwana) and afterwards. (neo gondwana)
Location of Gondwana?
[edit]The article says, ...Gondwana was centered roughly where Antarctica is today (at the extreme south of the globe), but the illustration shows it stretching from the south pole to just north of the equator. Either the picture is wrong, or the text is. -- RoySmith (talk) 02:39, 27 December 2005 (UTC)
Gondwana merging?
[edit]This is confusing. The article on Pangea says that it split into Gondwana and Laurasia 180 MYa, but the article on Gondwana says that it merged with Laurasia into Pangea. Perhaps someone is thinking backwards in time?
Gondawan + Laurasia > Pangaea?
[edit]I think the information in this article is incorrect, or at least does not offer a complete account of the events in question. As far as i am aware, the breakup of Pangaea led to the creation of the continents of Laurasia and Gondwanaland,with Gondwanaland subsequently breaking up into the continents we know today, not Laurasia merging with Gondwanaland to create Pangaea as described in the article. I am not an expert in this field, so i cannot rewrite this article, but i think the informationn in it is wrong, and would welcome a revision of the article by someone with full knowledge of this topic.
- The only knowledge I have of this topic is from the Wikipedia articles on Pangea and Rodinia. I reworded this article to agree with them. thx1138 11:05, 26 April 2006 (UTC)
- I still find the article confusing, although it may be that I'm just unfamiliar with the terminology. The first paragraph suggests that Gondwana originated at the breakup of Pangaea ("a protracted process beginning with the breakup of Pangea") but the caption of the first diagram says that it was the other way around: Pangaea was formed from Gondwana merging with Laurasia. A page I found ([1]) suggests that Gondwana was formed originally from the breakup of the supercontinent Rodinia 500 million years ago, then later it merged with Laurasia to form Pangaea, then even later it broke off again, retaining its identity as Gondwana. It is a little odd that the same name, Gondwana, is used for both before and after it was part of Pangaea. At any rate the text should be consistent with the diagram caption. Mathew5000 05:08, 28 April 2006 (UTC)
With the latest revision, the first caption states that Pangaea was formed from the "diverging" of Laurasia and Gondwana. Shouldn't that be "converging"? Or am I misunderstanding this. Also the text of the article still is not consistent with the idea that Gondwana predated Pangaea, then became part of Pangaea, then existed separately again after Pangaea broke up. --Mathew5000 04:23, 4 May 2006 (UTC)
- The conventional Gondwana = Africa + S. America + Antarctica + Australia + India - more or less existed by sometime in Late Cambrian time: [2]. Pangea was assembled by collisions among Gondwana, North America and Europe (sometimes called Euramerica) and Siberia, plus various continental plates in central and eastern Asia, though it is somewhat debatable as to how truly amalgamated the latter were to the "main mass" of Pangea. When Pangea began to break apart, the separation of most (but not all - Florida, for example, is a left-behind bit of Gondwana) of Gondwana left Laurasia as the primary "other" continent, so it is fair to say Pangea split into Laurasia plus a newly re-independent, slightly modified Gondwana. I too was confused by the caption saying Pangea was formed by diverging continents, when indeed the opposite is the case. Mathew5000 has it right. Also, it is not correct to think of any of this as occurring at specific times - as the North Atlantic began to open to separate most of Gondwana from most of Laurasia, the initial elements of the breakup of Gondwana were already beginning; it was not long (geologically speaking!) before South America began to separate as the South Atlantic opened, and some of the other rifting within Gondwana was showing the first signs of happening. --Geologyguy 22:09, 13 May 2006 (UTC)
- I changed the caption and changed and expanded the text somewhat to try to achieve clarity and more information - have I succeeded, at least on the clarity issue? I'll work on references and better timing for the breakup of Gondwana. --Geologyguy 16:29, 15 May 2006 (UTC)
- Yes, your revisions improved the article quite a bit. Thanks! There's a sentence that still needs some revision; either there's a word missing or it's punctuated wrong: "Gondwana was centered, in the late Paleozoic, roughly where Antarctica is today (at the extreme south of the globe), the climate was generally mild." --Mathew5000 22:53, 15 May 2006 (UTC)
- I changed that line a bit to clarify the relations among geography, mild climate, and glaciation. --Geologyguy 00:14, 21 May 2006 (UTC)
Gondwana Alive
[edit]The various continental plates have been moving around ever since the crust of the earth cooled and hardened. In really early days, 700 MYa, the earth was a lot smoother, making the oceans shallower, but covering up most of the earth's surface area. As they slowly began to push into each other, they started lifting in areas, predominantly in the centres of the plates (defined by fault lines). Around 600MYa, they started slowly rising, quite scattered at first, maily in the Polar Regions. These two rather small polar regions slowly started drifting towards each other, and at the same time, the compression caused more and more of what would become Pangea to rise out of the sea. It almost seems at though the polar regions then "bounced" off each other, splitting Pangea in to the northern Laurasia and southern Gondwanaland super-continents, which then again, as was correctly questioned above, split further, forming the world as we know it today.
More importantly, the Gondwanan continents, contain almost all of the worlds biodiversity. The sad thing is that over 70% of the biodiversity hotspots—the world's richest areas of floral diversity–have been destroyed by agriculture and human habitation.
Gondwana Alive, a not-for-profit organisation registered in South Africa has defined 40 corridors, across the world, where we have the richest geological heritage and floral biodiversity. We're lobbying support to have these defined as UNESCO biosphere reserves, and looking at ways in which we can protect these areas.
If you're interested, please visit the Gondwana Alive web site at http://www.GondwanaAlive.org.
Geology and climate. Why not flora
[edit]The existence of Gondwana is clearly affirmed by the floristic relationships between the modern land masses that formerly comprised the super continent. If the article contains discussions of geological and climatological development, would it not further benefit from an inclusion of a discussion of the uniqueness of this flora, and that flora's role in confirming the supercontinent's existence?
The fact that one can find Fuschias in New Zealand and Chile, Araucarias in South America, as well as throughout the Pacific landmasses, all help tell the story of what went where, when and how.
This topic is not sufficiently within my expertise to reduce it to a written component of the article. But I hope someone out there can do so.
Etymology
[edit]Gondwanaland term is derived from gond tribes in central India?
- True. It's in the article in two places. Cheers Geologyguy 19:16, 14 March 2007 (UTC)
South America
[edit]- In Gondwana#Formation and the two maps, where did the rest of South America (e.g. Argentina) come from? Anthony Appleyard 09:16, 14 July 2007 (UTC)
- The history of Patagonia is poorly understood and poorly constrained; see [3]. But it is likely that a complex of small terranes had amalgamated and was accreted to the main South American Cratons by Devonian time, perhaps by Ordovician. I've seen some things that suggest that the Cape Fold Belt may be a late-stage (Carboniferous) expression of whatever collision was amalgamating Patagonia to South America, even as West Gondwana was accreting to East Gondwana.
- The western terranes of South America - Andean, including incorporated terranes like the Precordillera - are pretty clearly later orogenic additions. Cheers Geologyguy 13:57, 14 July 2007 (UTC)
Gondwana
[edit]Any first year angineering student will tell you that a lump on the side the plant which is latge enough to represent a land mass would put the whole planet out of balance, ans therefore in a stste of self destruction, so the theory of Gondwana is just that a theory.
A better supposition would be that the plant 20 million years ago was about one third the diameter it is now, and the expansion of the globe broke up the crust into continents and the water which covered it drained into the gaps, the volcanic areas are still filling in the breaks today.
Also what "forces" broke up the Gondwana continent, there must have been equal and opposite forces keeping it togather
This would sxplain the many changes from a water logged planet to a dry continent
must go, will contiue soon
Doyle street
Doylestreet (talk) 09:07, 25 February 2009 (UTC)
- Yeah, any "angineering" student would tell you this. The kind maybe who couldn't spell "engineering" a year ago, and now is one. No one who knows anything about planets would tell you that a giant land mass could disrupt a planet's orbit or spin cycle. After all, look at the Northern Hemisphere which is packed with Eurasia plus, while the Southern Hemisphere is nearly all water. Remember that Mount Everest is about 5 miles high, and the diameter of the Earth is about 8000 miles. So these land masses can be compared to a thin skin on an apple. They ain't going to affect nothin'. Myles325a (talk) 00:25, 26 September 2009 (UTC)
- Actually, a first year engineering student might not know any engineering, since they would be taking only basic science courses. More to the point, the fundamental mistake is in viewing this as an engineering problem, by assuming an axis first and then worrying about mass distribution. For an object spinning freely in space, it's really the other way around: The mass distribution defines the axis, as a line through the center of mass. Any object, no matter how lumpy, is always balanced around that point. (There may also be a buoyancy argument, where heavier crust displaces enough mantle to cancel out the extra mass.) 24.93.19.91 (talk) 04:29, 7 August 2016 (UTC)
Image of a species that exhibits "Gondwanan distribution"
[edit]If some of the image clutter can be resolved (Since I think this article is approaching a to many as it is) I would suggest File:Nothofagus demis.JPG to demonstrate the "Gondwanan distribution" of the plant genus Nothofagus. Anyone have an opinion on which image would be appropriate to illustrate this pattern? — raeky (talk | edits) 01:44, 13 June 2010 (UTC)
- That is a great image for illustration. However, the WP:CAPTION needs to be improved. I have added it to the article. Please help me tweak the caption. I will try to rearrange the images.-TonyTheTiger (T/C/BIO/WP:CHICAGO/WP:FOUR) 02:04, 13 June 2010 (UTC)
- Caption seems ok now, and good work rearranging the images. Looks less of a mess now. — raeky (talk | edits) 02:15, 13 June 2010 (UTC)
The alternative Gondwana
[edit]This article should probably mention the recent Biogeografía paper by Dennis McCarthy et al: "An alternative Gondwana: Biota links South America, New Zealand and Australia". It presents an argument in favor of an alternative configuration of Gondwana based on biological dispersal frequencies. The article seems to have attracted a fair amount of attention from biogeographers, including discussion in the book Comparative Biogeography. Kaldari (talk) 19:59, 20 February 2012 (UTC)
New Zealand?
[edit]if New Zealand was once connected to Australia then wouldn't it have been a part of Gondwana? Rfkzsaok7 (talk) 06:03, 14 October 2012 (UTC)
- Indeed, and both New Zealand and Zealandia (continent) are mentioned in the article. --Fama Clamosa (talk) 06:42, 14 October 2012 (UTC)
Turkey
[edit]What about the Anatolian Plateau? — Preceding unsigned comment added by 77.180.6.85 (talk) 14:47, 19 February 2013 (UTC)
- According to the Geology section of the Turkey page, Anatolia was raised out of the Tethys ocean through the continents of Laurentia and Gondwana colliding.--Mr Fink 15:27, 19 February 2013 (UTC)
Further reading
[edit]I removed the following citations from the article. As far as I can tell they were used as references many years ago but are less helpful now. --Fama Clamosa (talk) 13:02, 3 March 2018 (UTC)
- Cattermole, Peter John (2000). Building Planet Earth: Five Billion Years of Earth History. London: Cambridge University Press. ISBN 978-0-521-58278-0. OCLC 317422973.
- Cowen, Richard (2000). History of Life (3rd ed.). Malden, MA: Blackwell Science. ISBN 978-0-632-04444-3. OCLC 41572551.
- Lowrie, William (1997). Fundamentals of Geophysics. Cambridge ; New York: Cambridge University Press. ISBN 978-0-521-46164-1. OCLC 35651121. Also ISBN 978-0-521-46728-5.
- Scheffler, K.; Hoernes, S.; Schwark, L. (July 2003). "Global changes during Carboniferous–Permian glaciation of Gondwana: Linking polar and equatorial climate evolution by geochemical proxies" (PDF). Geology. 33 (7): 605–608. Bibcode:2003Geo....31..605S. doi:10.1130/0091-7613(2003)031<0605:GCDCGO>2.0.CO;2. Retrieved 10 September 2017.
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(help)
Current lead starts with a near-direct paraphrase of the Torsvik & Cocks (2013) abstract.
[edit]The current lead needs rewriting. Right now it begins,
Gondwana, or Gondwanaland, was a supercontinent that formed from the unification of several cratons in the Late Neoproterozoic, merged with Euramerica in the Carboniferous to form Pangaea, and began to fragment in the Mesozoic. It was the largest continental landmass on Earth, covering an area of 100,000,000 km2 (39,000,000 sq mi) or 64% of today's continents.
It then cites the Torsvik & Cocks (2013) abstract, which begins:
Gondwana is reviewed from the unification of its several cratons in the Late Neoproterozoic, through its combination with Laurussia in the Carboniferous to form Pangea and up to its progressive fragmentation in the Mesozoic. For much of that time it was the largest continental unit on Earth, covering almost 100 million km2, and its remnants constitute 64% of all land areas today.
While this isn't a direct copy, I think it's too close a paraphrase, and furthermore, by removing "For much of that time", it distorts the meaning of the paraphrased text. The sentence came to my attention because I saw "It was the largest continental landmass on Earth" and immediately thought "wait, what about Pangaea?".
This is the edit responsible.
--Colin Douglas Howell (talk) 08:30, 13 March 2018 (UTC)
- Colin Douglas Howell, I made that edit. Thank you for taking your time to discuss it. I did spend parts of last year looking for a better opening sentence. In my opinion the sentence in question is the best WP:LEAD-style summary I've found and it is difficult to reword. In order to avoid wp:paraphrase, the authors (of course) develop their brief summary in the abstract in the introduction section of the article (PDF available here). For example:
“ | From its unification in the Late Neoproterozoic to its amalgamation with Laurussia in the Carboniferous to form Pangea, Gondwana was the largest unit of continental crust on Earth for more than two
hundred million years. |
” |
- Gondwana has been called a supercontinent, continental unit and continent; Torsvik & Cocks call it a superterrane. Here on Wikipedia simply linking to supercontinent gives readers a chance to read more about various definitions and naming conventions on that page.
- --Fama Clamosa (talk) 20:37, 13 March 2018 (UTC)
Fama Clamosa , I agree with Colin Douglas Howell that the current lead paragraph is too close a paraphrase of the Torsvik and Cocks (2013) article. Here is my suggested revision:
Gondwana, or Gondwanaland, was a supercontinent that existed from the Neoproterozoic (about 550 million years ago) until the Carboniferous (about 320 million years ago). It was formed by the accretion of several cratons. Eventually, Gondwana became the largest piece of continental crust of the Paleozoic Era, covering an area of about 100,000,000 km2 (39,000,000 sq mi). During the Carboniferous, it merged with Euramerica to form a larger supercontinent called Pangaea. Gondwana (and Pangaea) gradually broke up during the Mesozoic Era. The remnants of Gondwana make up about two-thirds of today's continental area.
GeoWriter (talk) 14:14, 14 March 2018 (UTC)
- OK, my bad. I rewrote per GeoWriter above. --Fama Clamosa (talk) 19:04, 14 March 2018 (UTC)
See also: Tarkine wilderness
[edit]The link to the Tarkine article in the "See also" section seems superfulous. I propose to remove it, or at least consider re-naming it "Tarkine rainforest", since presumably the connection is that this area contains a large tract of rainforest rich in Gondwanan relics such as Nothofagus. MFdeS (talk) 03:29, 11 December 2018 (UTC)
- There's been no objection in the last week, I'll remove it. MFdeS (talk) 00:19, 18 December 2018 (UTC)
Everything in this article is FACT!
[edit]"Gondwana was a supercontinent that existed from the Neoproterozoic (about 550 million years ago) until the Jurassic (about 180 million years ago)." FACT! Got that. This is fact! Because of our certainty, we forbid the use of the word "theorized". Bob Enyart, Denver KGOV radio host (talk) 13:50, 18 June 2019 (UTC)
Greater Adria
[edit]The title "Greater Adria" redirects here and then is never mentioned anywhere in the article. What gives? Was Greater Adria a part of Gondwana? Is it not considered a valid term? 66.177.19.59 (talk) 19:34, 19 October 2019 (UTC)
Introduce popular terms upper and lower Gondwana?
[edit]The literature has thousands of uses of the terms Upper Gondwana and Lower Gondwana, though commonly without definition, and it's hard to find any definition online, let alone one that lay people can understand. Perhaps this article could present and explain these terms, maybe with a map. ScienceDirect states: "Excluding coastal Gondwana, Unit D, represented by hill-forming feldspar-poor, quartz-arenite and variegated claystones, indicating products of deep chemical weathering, is classified as the Upper Gondwana, whereas the remaining A-C lithounits are considered the Lower Gondwana." Bob Enyart, Denver KGOV radio host (talk) 15:37, 16 December 2019 (UTC)
Timespan
[edit]The lead seems a bit confusing, from my reading, the general opinion is that Gondwana broke up during the Cretaceous period, rather than the Jurassic, with some elements like the South America-Antarctica split extending into the Cenozoic. What are others thoughts on this? Hemiauchenia (talk) 04:45, 14 November 2020 (UTC)
State of this article
[edit]Clearly, this article is not up to the standard of WP:PALEO and Wikipedia as a whole. Perhaps it would be beneficial to split it up by major timeperiod, into a Mesozoic and Paleozoic article. It also seems that most of the text is overly complicated, especially for the laymen. Besides all this the headings have weird names that feel more like the titles of book chapters than the headers of a Wikipedia article. Further thoughts on how to improve this article? TimTheDragonRider (talk) 19:52, 30 March 2022 (UTC)
- I do support a split into Mesozoic Gondwana and Palezoic Gondwana articles. Another suggestion for improvement: add more maps. Maps, I find, explain far, far better what a place looked like in prehistory than any paragraph. Even better if there's maps that show what the environment was like at the time and aren't just outlines of modern-day landmasses apparently spliced together. SilverTiger12 (talk) 19:57, 30 March 2022 (UTC)
- I will proceed with a formal splitting application as soon as possible then. TimTheDragonRider (talk) 19:58, 30 March 2022 (UTC)
- Don't discard the original article. Have it reference the two new articles. (Perhaps that goes without saying.) --Kent G. Budge (talk) 20:30, 30 March 2022 (UTC)
- I suspect that most users of Wikipedia will search for "Gondwana" not "Paleozoic Gondwana" and "Mesozoic Gondwana". Also wikilinking to "Gondwana" in other articles would probably become awkward/problematic if the "Gondwana" article was split into "Paleozoic Gondwana" and "Mesozoic Gondwana". This Gondwana article should be kept. New articles for various timespans could be added. Inclusion of geological maps of ancient continents is often/usually prevented by copyright restrictions because almost all such maps are copyrighted personal interpretations (whereas maps of present-day continents are factual outlines of coasts and are copyright-free). But if maps of past continents can be found or created, which are compatible with the licensing requirements of Wikipedia, I would welcome their inclusion in this and other articles. GeoWriter (talk) 21:57, 30 March 2022 (UTC)
- I generated some maps for the Pangaea article. I suspect these are not what we want for these articles, since I didn't mark the present continent boundaries (for simplicity), but if I have a good idea what is wanted, I can probably generate some more. (Not necessarily quickly.) --Kent G. Budge (talk) 22:38, 30 March 2022 (UTC)
- 1) This Gondwana article could simply be turned into a disambig directing people to the various Gondwana something-or-others (there's more than just the supercontinents).
- 2) I am hoping for maps that show, say, the topography/environment, i.e. deserts, mtns, and forests, as well as just the shape. Or, maps that have arrows indicating movement of the landmasses. SilverTiger12 (talk) 00:04, 31 March 2022 (UTC)
- I agree that a majority of people will simply search up simply "Gondwana" or "Gondwanaland", as that is by far the most common term and even professional geologists usually do not specify pre-or post-Pangea. This alone means that it is very likely beneficial to keep this single article. The fact that this is a significant distinction is still important to acknowledge, however rather than two completely new articles, would it not be simpler to work on this article such that the two time periods are more clearly defined? Such as clearer section titles (perhaps the informal and easily understood "early" and "late" Gondwana) and a few sentences in the lede explaining how Gondwana became a part of, then separated from, Pangea. The article does need a lot of work, but splitting this article into two entirely new articles, or creating two articles and minimising this one both strike me as excessive moves which would cause more confusion and clutter than benefit. XiphosuraTalk∞Edits 07:06, 13 June 2022 (UTC)
- I generated some maps for the Pangaea article. I suspect these are not what we want for these articles, since I didn't mark the present continent boundaries (for simplicity), but if I have a good idea what is wanted, I can probably generate some more. (Not necessarily quickly.) --Kent G. Budge (talk) 22:38, 30 March 2022 (UTC)
- I suspect that most users of Wikipedia will search for "Gondwana" not "Paleozoic Gondwana" and "Mesozoic Gondwana". Also wikilinking to "Gondwana" in other articles would probably become awkward/problematic if the "Gondwana" article was split into "Paleozoic Gondwana" and "Mesozoic Gondwana". This Gondwana article should be kept. New articles for various timespans could be added. Inclusion of geological maps of ancient continents is often/usually prevented by copyright restrictions because almost all such maps are copyrighted personal interpretations (whereas maps of present-day continents are factual outlines of coasts and are copyright-free). But if maps of past continents can be found or created, which are compatible with the licensing requirements of Wikipedia, I would welcome their inclusion in this and other articles. GeoWriter (talk) 21:57, 30 March 2022 (UTC)
- Don't discard the original article. Have it reference the two new articles. (Perhaps that goes without saying.) --Kent G. Budge (talk) 20:30, 30 March 2022 (UTC)
- I will proceed with a formal splitting application as soon as possible then. TimTheDragonRider (talk) 19:58, 30 March 2022 (UTC)
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