tag:blogger.com,1999:blog-7785493.post3067577772273220122..comments2024-01-04T04:11:55.717+02:00Comments on Dienekes’ Anthropology Blog: Cosmic impact event ~12.8kya caused the Younger DryasDienekeshttp://www.blogger.com/profile/02082684850093948970noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-7785493.post-32652113216171299402013-05-24T11:57:23.038+03:002013-05-24T11:57:23.038+03:00How many "Younger Dryas" can you count i...How many "Younger Dryas" can you count in Greenland during the last glaciation?<br /><br /><a href="http://upload.wikimedia.org/wikipedia/commons/6/66/Ice-core-isotope.png" rel="nofollow"></a>Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7785493.post-10262776156391732172013-05-24T03:41:17.461+03:002013-05-24T03:41:17.461+03:00"So finally! The impact-deniers will hopefull..."So finally! The impact-deniers will hopefully give up! Yeah, humans with Kalashnikovs killed off all megafauna within several hundreds of years, Clovis dissapeared by chance etc...." <br /><br />Don't get too excited. Mammoths survived on Wrangel Island long after the period covered here so<br />their extinction on that island cannot possibly be related to any cosmic event 12,000 years ago. Besides which it seems we now have an explanation for how humans drove the megafauna to extinction: <br /><br />http://www.nzherald.co.nz/world/news/article.cfm?c_id=2&objectid=10884722<br /><br />Quote: <br /><br />"Among late-surviving mastodons he has studied, Dan is finding examples of females losing calves (where one pregnancy is immediately followed by another, rather than by two years of lactation) and of males going into musth early (just as young bull elephants do in Africa, when mature males are poached out). Dan had also found examples of mammoths dying in the autumn, a time of year when they should have been in peak condition. Autumn deaths argued for an extrinsic cause of death. For Dan, all this could be pinned on one such cause: overhunting by humans". <br /><br />And: <br /><br />"Kill-sites exist that show humans were certainly, at least occasionally, hunting these formidable beasts. But it's hard to argue from those isolated cases that humans were responsible for wiping out entire species. Far from rampaging across the continent, killing every large mammal in sight, it seems ancient hunters may have had a more subtle, but no less terminal impact. Over thousands of years, the level of hunting was just enough to be unsustainable for these huge, slow-breeding behemoths of the ice age". <br /><br />I think your perspective is motivated by a belief that pre-industrial humans lived in complete harmony with their environment. That belief cannot be supported by the evidence. terrythttps://www.blogger.com/profile/17327062321100035888noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-91069834138872145402013-05-22T11:12:04.592+03:002013-05-22T11:12:04.592+03:00I suppose it is safe to assume then, that the most...<i>I suppose it is safe to assume then, that the most recent major bottle-neck in Human DNA must have occurred at that time.</i><br /><br />No - this only affected fairly northern latitudes, and unlike LGM, people actually continued to live right at the edge of the ice. Sure, without the Younger Dryas event, expansion would not have halted / slightly reversed, but we are talking about a very small percentage of the total world population at the time.<br /><br />The back-and-forth may have actually induced some mixing of Western and Eastern European populations (and West Asian ones) that would have otherwise not occurred - in effect making the European gene pool a bit broader and more homogenous than otherwise expected.eurologisthttps://www.blogger.com/profile/03440019181278830033noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-50632477400168828212013-05-22T02:00:02.226+03:002013-05-22T02:00:02.226+03:00So finally! The impact-deniers will hopefully give...So finally! The impact-deniers will hopefully give up! Yeah, humans with Kalashnikovs killed off all megafauna within several hundreds of years, Clovis dissapeared by chance etc....WarLordhttps://www.blogger.com/profile/03775106542175359906noreply@blogger.comtag:blogger.com,1999:blog-7785493.post-26951926977438425232013-05-22T00:13:44.194+03:002013-05-22T00:13:44.194+03:00I suppose it is safe to assume then, that the most...I suppose it is safe to assume then, that the most recent major bottle-neck in Human DNA must have occurred at that time.shenandoahhttps://www.blogger.com/profile/09220865518565583662noreply@blogger.com