Poster About Fire Prevention

mammoth killer under fire

was the basis of findings of unusual magnetic beads postulated in recent times, a meteorite impact in the Northern Hemisphere at the border to Younger Dryas . This time at the end of the last ice age is characterized by a sharp drop in temperatures again, the cause is still not fully understood.

The hypothetical impact should explain this now, and was therefore soon with the extinction of mammoths and the decline of the North American Clovis culture work brought . After Firestone et al. In 2007, this hypothesis PNAS in a 'peer reviewed ' submitted articles is a pretty interesting discussion about this hypothesis flared . piecemeal in recent years, the arguments of the Impaktvertreter were put to the test and one after the other refuted (see . Paquay et al, 2009).

Now that the proof of hexagonal nano-diamonds - could be in a new study does not even reproduce, passed - the last sound argument of the impact fraction ( Kennett et al, 2009.) sich auch das renommierteste Wissenschaftsjournal SCIENCE mit dem empfehlenswerten Artikel: 'Mammoth-Killer Flunks Out' (Kerr, 2010) von dieser Hypothese: No impact, thank you.

Literatur:

Firestone RB, et al. (2007): Evidence for an extraterrestrial impact 12,900 years ago that
contributed to the megafaunal extinctions and the Younger Dryas cooling. PNAS 104(41):16016–16021.

Kennett DG, et al. (2009): Nanodiamonds in the Younger Dryas boundary sediment layer. Science 323:94.

Paquay et al. (2009):Absence of geochemical evidence for an impact eventat the Bølling–Allerød/Younger Dryas transition. PNAS 104 (51): 21505-21510

Kerr, R. (2010): Mammoth-Killer Flunk Out, Science 329:1140-1141