A group of scientists, including UC Santa Barbara’s James Kennett, professor emeritus in the Department of Earth Science, posited that a comet collision with Earth played a major role in the extinction. Their hypothesis suggests that a cosmic-impact event precipitated the Younger Dryas period of global cooling close to 12,800 years ago. This cosmic impact caused abrupt environmental stress and degradation that contributed to the extinction of most large animal species then inhabiting the Americas. According to Kennett, the catastrophic impact and the subsequent climate change also led to the disappearance of the prehistoric Clovis culture, known for its big game hunting, and to human population decline.

“We conclusively have identified a thin layer over three continents, particularly in North America and Western Europe, that contain a rich assemblage of nanodiamonds, the production of which can be explained only by cosmic impact,” Kennett said. “We have also found YDB glassy and metallic materials formed at temperatures in excess of 2200 degrees Celsius, which could not have resulted from wildfires, volcanism or meteoritic flux, but only from cosmic impact.”

To date, scientists know of only two layers in which more than one identification of nanodiamonds has been found: the YDB 12,800 years ago and the well-known Cretaceous-Tertiary boundary 65 million years ago, which is marked by the mass extinction of the dinosaurs, ammonites and many other groups.

“The evidence we present settles the debate about the existence of abundant YDB nanodiamonds,” Kennett said. “Our hypothesis challenges some existing paradigms within several disciplines, including impact dynamics, archaeology, paleontology and paleoceanography/paleoclimatology, all affected by this relatively recent cosmic impact.”

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Scientists are investigating what may be the oldest identified race war 13,000 years after it raged on the fringes of the Sahara.

French scientists working in collaboration with the British Museum have been examining dozens of skeletons, a majority of whom appear to have been killed by archers using flint-tipped arrows.
The bones – from Jebel Sahaba on the east bank of the Nile in northern Sudan – are from victims of the world’s oldest known relatively large-scale human armed conflict.
Over the past two years anthropologists from Bordeaux University have discovered literally dozens of previously undetected arrow impact marks and flint arrow head fragments on and around the bones of the victims.


The identity of their killers is however less easy to determine. But it is conceivable that they were people from a totally different racial and ethnic group – part of  a North African/ Levantine/European people  who lived around much of the Mediterranean Basin.

The two groups – although both part of our species, Homo sapiens – would have looked quite different from each other and  were also almost certainly  different culturally and linguistically. The sub-Saharan originating group had long limbs, relatively short torsos and projecting upper and lower jaws along with rounded foreheads and broad noses, while the North African/Levantine/European originating group had shorter limbs, longer torsos and flatter faces. Both groups were very muscular and strongly built.

Certainly the northern Sudan area was a major ethnic interface between these two different groups at around this period. Indeed the remains of the North African/Levantine/European originating population group has even been found 200 miles south of Jebel Sahaba, thus suggesting that the arrow victims were slaughtered in an area where both populations operated.

What’s more, the period in which they perished so violently was one of huge competition for resources – for they appear to have been killed during a severe climatic downturn in which many water sources dried up, especially in summer time.

The climatic downturn – known as the Younger Dryas period – had been preceded by much lusher, wetter and warmer conditions which had allowed populations to expand. But when climatic conditions temporarily worsened during the Younger Dryas, water holes dried up, vegetation wilted and animals died or moved to the only major year-round source of water still available – the Nile.
Humans of all ethnic groups in the area were forced to follow suit – and migrated to the banks (especially the eastern bank) of the great river. Competing for finite resources, human groups would have inevitably clashed – and the current investigation is demonstrating the apparent scale of this earliest known substantial human conflict.

http://www.independent.co.uk/news/science/archaeology/saharan-remains-may-be-evidence-of-first-race-war-13000-years-ago-9603632.html (via fuckyeahdarkextropian)

look we don’t know at all who the killers were, but it is *inconceivable* that early man could get his ass kicked by a bunch of Neanderthals ok. They certainly couldn’t have had technological superiority either, just because they might have recently come down from the harsh European tundra environment they’d pitted themselves against for thousands of years, developing a unique culture, as mountain passes thawed out, glaciers melted etc. No. Human pride yo.

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These species were not just ornaments of the natural world. The new work presented at the conference suggests that they shaped the rest of the ecosystem. In Britain during the last interglacial period, elephants, rhinos and other great beasts maintained a mosaic of habitats: a mixture of closed canopy forest, open forest, glade and sward. In Australia, the sudden flush of vegetation that followed the loss of large herbivores caused stacks of leaf litter to build up, which became the rainforests’ pyre: fires (natural or manmade) soon transformed these lush places into dry forest and scrub.

In the Amazon and other regions, large herbivores moved nutrients from rich soils to poor ones, radically altering plant growth. One controversial paper suggests that the eradication of the monsters of the Americas caused such a sharp loss of atmospheric methane (generated in their guts) that it could have triggered the short ice age which began about 12,800 years ago, called the Younger Dryas.

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