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Posted: Wed Jul 09, 2008 8:14 pm
by Knuckle sandwhich
You can be sure "they thought of it"
Don't bet the farm on that. There are a lot of archaeologists out there that aren't all that sharp.
But over-all I agree that they didn't jump boundaries in the main body of the paper. They sure as heck did in the title, and that was likely calculated for sensationalism. That is a common theme among poor dead-end hypotheses being presented in archaeology.
Posted: Wed Jul 09, 2008 8:16 pm
by rich
Why dead end? It's still on-going and sort of looks like it may be picking up momentum too.
Posted: Wed Jul 09, 2008 8:42 pm
by Knuckle sandwhich
rich wrote:Why dead end? It's still on-going and sort of looks like it may be picking up momentum too.
How will it ever lead to any demonstration of causality? In reality, it isn't even fit to be a hypothesis if you consider the current state of things. You can't even test it, which is quite convenient for them.
Posted: Wed Jul 09, 2008 8:50 pm
by rich
Hmmm - I disagree. I think you can test it with a certain amount of accuracy. Computer modelling has come a long way. You can show the known places of habitat and the possible places of habitat and from there extrapolate the damage that may have been caused. Of course that would be subject to the models tested, in that sense I agree it wouldn't be 100% accurate, but it can be made good enough to show plausibility.
Posted: Wed Jul 09, 2008 8:58 pm
by Knuckle sandwhich
I don't think enough is known about what causes a giant meteor strike might have on mammoth, much less have a good handle on the weather patterns at that time or how the biota that mammoth interacted with might be affected.
Any attempt would have to include old world mammoths as well.
Posted: Wed Jul 09, 2008 9:03 pm
by rich
But they could possibly show the affects on plants in the areas involved. It wouldn't take long for animals to die off from lack of vegetation - or water. And I'm pretty sure there's some brainkid out there that can figure even more if he set his or her mind to it.
Even if the vegetation grew back within say fifty years - that would be plenty of time for species to die off. Probably just a couple of weeks at the max. And water probably even less. Camels might live longer without water - but not that much. Birds would probably last longest, but even they would eventually die off or "fly south".
Posted: Wed Jul 09, 2008 9:27 pm
by rich
Also - different type plants need different amounts of water to be sustained. A dryspell for a given length of time would especially affect the vegetation in an area - at least for a certain period of time. May be able to offshoot the results on plants from this. Soil samples should be able to provide pollen and/or lack of it also for certain time periods.
Posted: Fri Jul 11, 2008 7:07 am
by Roberto
www.perigeezero.org/treatise/timeline/index.html
Came across this while searching for information concerning
geological events around 800 A.D. Some interesting reading,
which I thought might be if interest for this topic.
CHEERS...
http://en.wikipedia.org/wiki/Taurid_meteor_shower
Posted: Fri Jul 11, 2008 12:17 pm
by Digit
The thing I found most interesting in the first graph was the degree of regularity with which the temp crossed the zero line.
Posted: Fri Jul 11, 2008 3:03 pm
by Minimalist
Tunguska gives a fair idea of the blast pattern of an impact. If the trees are flattened, I wouldn't give much of a chance for the well-being of any unprotected animal.
Posted: Mon Jul 21, 2008 7:33 pm
by Minimalist
More on the topic.
http://www.dispatch.com/live/content/lo ... ml?sid=101
Tankersley's finds this year were resting a few inches beneath the surface in a remote part of Shawnee Lookout, a park west of Cincinnati.
East of the city, near Newtown, Tankersley also has found copper, gold, silver and tiny diamonds as well as pieces of the Canada comet.
He found more of the same in Sheriden Cave, in Wyandot County. The metals were found in a layer of earth that includes charcoal and burnt remains of a giant beaver and pig.
Carbon dating suggests that the layer is 12,900 years old, right when the comet was supposed to have exploded.
Posted: Tue Jul 22, 2008 5:32 am
by Roberto
http://lithiccastinglab.com/gallery-pag ... epage1.htm
Some fascinating work here at Sheridan Cave.
Wouldn't mind reading the field work material
and visiting the site.
Posted: Wed Jul 23, 2008 8:40 am
by Minimalist
From Science Daily....something I have wondered about for a while. An asteroid hit, even if the blast zone did not extend further than north america would have had dire impacts on the climate through the nuclear winter scenario. This fellow is looking at the Younger Dryas as the result.
http://www.sciencedaily.com/releases/20 ... 140432.htm
The Younger Dryas event refers to an unexpected rapid cooling of the earth that is known to have lasted about 1,300 years. It coincided with widespread extinctions of species, but, although the event itself is well-documented, scientists are still unclear of whether its impact was felt equally all across the globe.
The extent of the impact in the Southern Hemisphere is, in particular, unresolved.
University of Cincinnati Professor of Geology Tom Lowell has researched evidence of historical climate change all over the globe, including significant amounts of research south of the equator. Just this month, he has returned from a month-long expedition to Peru, where he and colleagues took samples near the Quelccaya Ice Cap.
Posted: Wed Jul 23, 2008 8:48 am
by kbs2244
Are the pieces starting to come together?
Posted: Wed Jul 23, 2008 11:38 am
by Digit
I like the unexpected bit! What has ever happened to our climate that was expected?
Roy.