Perpetually penultimate mammoth ping.
Coyotes.
Coyotes killed ‘em.
They really DON’T know. For a while, some theory is in vogue and everybody swears it’s the truth. Then a piece of bone is discovered and the theory is proven to be untrue. The new theory becomes the established dogma. That is, until a piece of rock is found where it shouldn’t be, and then it begins all over again.
I suspect the supply and depth of dihydrogen oxide exceeded many of these creatures ability to absorb and excrete it as measured by rate verses time...
;)
The comet hit in an area of Canada with extensive gold deposits ~ they were splashed up into the air and came down all over the Ohio Valley.
The only sites not washed out by continuing heavy flooding following the Younger Dryas were the tops of hills throughout the region ~ virtually ALL of the gold in Indiana was found on TOP of hills in Monroe, Brown and Johnson counties.
Usually gold is found inside glacial deposits, not on top of them!
These deposits were sufficiently large that they were known to the Indians throughout what is now the American South East.
As DeSoto advanced North whenever he asked the Indians he met where the gold was they pointed pretty much to the same site ~ Southern Indiana. Due to seasonal flooding he had to follow the high ground along the Wabash (see Terre Haute), but as soon as possible he sent an expedition to the SE toward an area where gold was found later. His people came back with a wagon load of iron pyrite and native copper ~ they completely missed the gold.
The flood killed them, the decaying matter created the massive coal beds and oil on the planet.
I suspect all those species became neighborhood animals in areas where the HOAs wouldn’t allow feeding.
Doesn't look like this debate is at all settled.
This is a forum comment from Dennis Cox, US Army blast damage photo recon interpreter, who is working closely with Richard Firestone in identifying global cometary impact sites from high res satellite photos. His findings deliver important and compelling evidence for a Shoemaker-Levy 9 type impact from the Taurid meteor stream that wiped out North American megafauna. This was an impact “shower” lasting perhaps an hour and completely resurfacing the Earth from Central Mexico to Northern Arizona. More on his contribution at: http://sites.google.com/site/dragonstormproject/Home
Some brief reasons why the Daulton et al paper is inept:
1. They did not collect from the YDB layer at the Arlington site that was used in the two Kennett et al papers, but from layers that contained “carbonaceous particles”, mostly charcoal – there are no diamonds in charcoal and it is not clear that they even sampled the YDB.
2. They did not collect or at least process the YDB sediment at Murray Springs, which contains most of the nanodiamonds in the YDB as loose nanodiamonds – probably too much work because the work is labor intensive – need to separate kilos of material. The diamonds average about 50 to 100 ppb and you need a lot of diamonds, processed by the correct separation protocol.
3. Yes, we saw graphene, graphane and chaoite, but these are not diamonds.
4. They analyzed microcharcoal and glassy carbon for diamonds and found none, neither did we! These “carbon particles” were made outside the constrains for diamond production and survival.
5. Two reviewers for the Kennett papers are world class shock and diamond experts – they had no problem.
6. One independent stratigrapher who read the Daulton paper was astonished at the “complete ineptness of field protocol and sample characterization”. Of course, you and others can judge for yourselves.
7. The Greenland paper will appear in September and there are sufficient diamond data in this paper (STEM, HRTEM, RAMAN, EELS, etc.) to prove once and for all that diamonds do, indeed, occur in the YDB.