 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Natural Science Forum / Biology / Paleontology / April 2006KT Boundary Inquiry
Where can I find up-to-date information on the period of time leading up to the KT Extinction Event? > Where can I find up-to-date information on the period of time leading up > to the KT Extinction Event? Google would be a good place to start. George > Where can I find up-to-date information on the period of time leading up > to the KT Extinction Event? Walter Alvarez's book "T. Rex and the Crater of Doom" >> Where can I find up-to-date information on the period of time leading up >> to the KT Extinction Event? > > Walter Alvarez's book "T. Rex and the Crater of Doom" I believe the question was about "up-to-date information". Isn't that book nearly ten years old? George > >> Where can I find up-to-date information on the period of time leading up > >> to the KT Extinction Event? [quoted text clipped - 3 lines] > I believe the question was about "up-to-date information". Isn't that book > nearly ten years old? So? >> >> Where can I find up-to-date information on the period of time leading >> >> up [quoted text clipped - 7 lines] > > So? So, it is not up-to-date information. It is also not an unbiased view of the current thinking. George > >> >> Where can I find up-to-date information on the period of time leading > >> >> up [quoted text clipped - 10 lines] > So, it is not up-to-date information. It is also not an unbiased view of > the current thinking. Seems pretty thorough to me. Can you point out significant weak points in his book? >> >> >> Where can I find up-to-date information on the period of time >> >> >> leading [quoted text clipped - 16 lines] > Seems pretty thorough to me. Can you point out significant weak points > in his book? The weakest link in the book is that it is ten years old. As such, there has since been tons of data collected and interpreted, a lot of which questions whether an impact actually caused the dinosaurs to go extinct. The date of the Yucatan impacter has been brought into question - it may be older than the K-T boundary event. That and the fact that the famous irridium layer has been found right smack in the middle of the Deccan traps, a fact which not only helps date the traps, but indicates that the volcanism associated with them was ongoing before during and after the K-T boundary event. In other words, a lot of data has been collected that dispute the impact theory of the demise of the dinosaurs, and that supports the volcanism associated with the Deccan traps and the resulting climate change as a possible major cause. These are my major beefs with the book. I'm sure there are others I've overlooked. The fact that the largest extinction level event in geologic history, that of the P-T event, is not associated with an impact, but is associated with the Siberian traps weakens the impact theory for the K-T event, and strengthens the theory for the Deccan traps being the most likely cause of the changes which resulted in the demise of the dinosaurs and many other lifeforms. Stay tuned. George > >> >> >> Where can I find up-to-date information on the period of time > >> >> >> leading [quoted text clipped - 39 lines] > > George Now, the Siberian Traps occured during major climatological changes caused by the formation of Pangea, thus I can't hold the Traps entirely responsible. Nothing so dramatic was going on when the Deccan Traps were underway, except for the Chixilub impact. Thus I consider it most likely that the impact was contributory to the extinction event at the K-T Boundary, much as the formation of Pangea was contributory at the P-T extinction event. In either event too many severe changes too fast for certain species to survive. >> >> >> >> Where can I find up-to-date information on the period of time >> >> >> >> leading [quoted text clipped - 58 lines] > extinction event. In either event too many severe changes too fast for > certain species to survive. I can't say that I agree with that assessment. Data from the nearly complete P-T boundary stratigraphic sections located in Greenland appear to indicate severe climate changes that coincided with the production of the Siberian Traps. It has been postulated that the Siberian volcanism caused a rise in global temperatures that was high enough to cause rapid release of clathrates built up on the ocean floor. The sudden release of such huge quantities of methane is suggested to have resulted in a runaway greenhouse that caused the extinctions. In addition, the evidence suggests that this happened repeatedly over an extended period of time, and very nearly coincided with the periodic eruptions in Siberia. That there were two 'great dyings' that coincide or nearly coincide with the release of massive quantities of basaltic lava onto the Earth's surface certainly does make a strong case that the events (the extinctions and the production of prodigious amounts of lava) are linked. George > >> >> >> >> Where can I find up-to-date information on the period of time > >> >> >> >> leading [quoted text clipped - 75 lines] > > George What of the climatic changes produced by the assembly of Pangea at or around the same time? As I said, contributory. I don't doubt the Siberian Traps would've produced a massive extinction event in and of themselves, but the contemporaneous tectonic events surely made matters much worse. >> >> >> >> >> Where can I find up-to-date information on the period of >> >> >> >> >> time [quoted text clipped - 100 lines] > What of the climatic changes produced by the assembly of Pangea at or > around the same time? As I said, contributory. I've not seen an papers that describe climate changes resulting from the coming together of the continents toform Pangea. Obviously, they would contribute to climate change in some way, but whether it would beenough to wipe out 95% of all species, I have a doubt. But then, neither have I seen the data. > I don't doubt the Siberian Traps would've produced a massive extinction > event in and of themselves, but the contemporaneous tectonic events > surely made matters much worse. Why? What tectonic changes could have had a more severe effect on land and aquatic life than the production of so much greenhouse gas, and the resulting increase in global atmospheric and oceanic temperatures, and how? George > >> >> >> >> >> Where can I find up-to-date information on the period of > >> >> >> >> >> time [quoted text clipped - 116 lines] > > George Habitat loss; coastal becomes inland, oceans currets chang,; wind patterns change, marshes and swamps dry up, change in humidity both local and world wide, change in sea leves, mountain building. Enough changes to place sufficient stress on species to push them over the edge towards extinction. Thus exaserpating the extinction event. George, you are a tad too enamored of the Siberian Traps. They were, after all, not the only act at that concert. > > >> >> >> >> >> Where can I find up-to-date information on the period of > > >> >> >> >> >> time [quoted text clipped - 125 lines] > George, you are a tad too enamored of the Siberian Traps. They were, > after all, not the only act at that concert. He is obsessed with the Deccan and Siberian traps. He went so far as to deny global dimming would result from an asteroid impact in a previous go around on whether the bolide impact was the proximate cause of the K-T extinction. >> > >> >> >> >> >> Where can I find up-to-date information on the period >> > >> >> >> >> >> of [quoted text clipped - 169 lines] > go around on whether the bolide impact was the proximate cause of the > K-T extinction. Umm, you'll have to refresh my memory on exactly when I made that statement, Ken. But since you brought it up, you'll have to provide some concrete evidence that such a dimming actually occurred. Yes, theoretically, if a large enough bolide were to strike the earth, you could get such dimming. The question is not whether or not that is possible, but whether or not dimming actually happened and caused the referred to extinctions. George > >> > >> >> >> >> >> Where can I find up-to-date information on the period > >> > >> >> >> >> >> of [quoted text clipped - 179 lines] > > George Can you show that dimming would not occur following such an event? We are, after all, taking about mega tons (at least) of material being thrown into the air. Followed by smoke from the fires. >> >> > >> >> >> >> >> Where can I find up-to-date information on the >> >> > >> >> >> >> >> period [quoted text clipped - 215 lines] > are, after all, taking about mega tons (at least) of material being > thrown into the air. Followed by smoke from the fires. I'll repeat: The question is not whether dimming could occur, but whether or not it DID occur. George >>> >> > >> >> >> >> >> Where can I find up-to-date information on the >>> >> > >> >> >> >> >> period [quoted text clipped - 220 lines] > > George No it isn't. Not with a crater that size. It's like asking if a 120 mm tank cannon can shoot through a paper plate. Just grounding the jets during the scare after the Twin Towers went down reduced dimming significantly in North America. It amounted to one degree extra difference in day and night temperatures in some regions. Figuring out how much dimming occurred and how long the dimming lasted after the impact will keep people busy a while. Anyone who wants to know if it occurred and demands evidence is pretty much asking to be walked around and by passed. >> >> >> >> >> >> Where can I find up-to-date information on the period of >> >> >> >> >> >> time [quoted text clipped - 144 lines] > changes to place sufficient stress on species to push them over the edge > towards extinction. Thus exaserpating the extinction event. All of the above are either long-term events or regional events, not something that happened globally and, geologically speaking, overnight. The evidence is that something geologically sudden happened, and on repeated ocassions over an extended ( 1 or 2 million years) period of time. > George, you are a tad too enamored of the Siberian Traps. They were, > after all, not the only act at that concert. They are the only act that explains the nearly sudden loss of 95% of all life on earth, IMHO. George > >> >> >> >> >> >> Where can I find up-to-date information on the period of > >> >> >> >> >> >> time [quoted text clipped - 157 lines] > > George Didn't the Permian Extinction occur over a period of time? >> >> >> >> >> >> >> Where can I find up-to-date information on the period >> >> >> >> >> >> >> of [quoted text clipped - 193 lines] > > Didn't the Permian Extinction occur over a period of time? Yes, as I stated above, over a 1-2 million year period. The Siberian traps were also laid down during the same time period. George > >> So, it is not up-to-date information. It is also not an unbiased view > >> of [quoted text clipped - 4 lines] > > The weakest link in the book is that it is ten years old. Age in itself does not mean squat. The research done was extraordinary. > As such, there > has since been tons of data collected and interpreted, a lot of which [quoted text clipped - 9 lines] > change as a possible major cause. These are my major beefs with the book. > I'm sure there are others I've overlooked. Have you read it? He talks about those issues and answers them. > The fact that the largest extinction level event in geologic history, that > of the P-T event, is not associated with an impact, but is associated with [quoted text clipped - 4 lines] > > George >> >> So, it is not up-to-date information. It is also not an unbiased >> >> view [quoted text clipped - 7 lines] > > Age in itself does not mean squat. The research done was extraordinary. And based on data, some of which is now in question. >> As such, there >> has since been tons of data collected and interpreted, a lot of which [quoted text clipped - 16 lines] > > Have you read it? He talks about those issues and answers them. Yes I have. It is not possible that he answered those questions, since the idea that gas clathrates were liberated during repeated global warming events caused by the volcanic eruptions of the Siberian traps, causing cycles of further global warming was first presented in 2002 by Gerry Dickens, long after the book was published. The fact that the irridium layer has been found in the middle layers of the Deccan traps is also a new finding. George >>> >> >> Where can I find up-to-date information on the period of time >>> >> >> leading [quoted text clipped - 39 lines] > > George I find it interesting that you don't think the two together could have vastly increased the number of extinctions. Its kind of like finding a body that has been run over by a car after being shot and trying to say that only one of the events contributed to the persons demise. This is only true if he was stone dead before being run over. By the way the event in Sibera was vastly larger. > > >> Where can I find up-to-date information on the period of time leading up > > >> to the KT Extinction Event? [quoted text clipped - 5 lines] > > So? For some reason we are in the habit of finding stuff all the time. It's as if we don't know the world as well as we think we do. :) >> > >> Where can I find up-to-date information on the period of time >> > >> leading up [quoted text clipped - 10 lines] > For some reason we are in the habit of finding stuff all the time. It's > as if we don't know the world as well as we think we do. :) I like that. Can I use that from time to time? George > >> > >> Where can I find up-to-date information on the period of time > >> > >> leading up [quoted text clipped - 14 lines] > > George You have my permission. >> >> > >> Where can I find up-to-date information on the period of time >> >> > >> leading up [quoted text clipped - 18 lines] > > You have my permission. Thanks, Alan. George > Where can I find up-to-date information on the period of time leading up > to the KT Extinction Event? Could you be more specific? What kind of information? I suppose you want to know what species were around during the Maastrichtian, or perhaps even the end of the Maastrichtian. Is that it? Given the uncertainty in temporal ranges of species (look up "Signor-Lipps effect" in particular), I think just the Maastrichtian would do. If you're interested in dinosaurs particularly, The Dinosauria will have this information. You might also consult faunal lists taken from Maastrichtian deposits. Google or, better, a paleontological database should work for this. One thing paleontologists commonly do is assemble lists of what taxa were found in particular deposits. |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.