Was there a Stone Age apocalypse or not? One narrative has it that about 13,000 years ago a comet blasted North America, wiping out the continent's megafauna – as well as its early settlers.
It's a compelling story, offering a simple explanation to the mystery of why mammoths, mastodons, and Clovis humans vanished. But it's a controversial theory, and new research suggests the impact was far too small to have done any serious damage.
Doubts centre on the speed of extinctions, the fate of the Clovis culture, and the presence of supposed impact signatures. But advocates of the comet-blast theory say they will present their own new data at the American Geophysical Union (AGU) meeting in San Francisco, where they will share the stage with sceptics.
"Nothing special happened at 12,900 years ago," says John Williams of the University of Wisconsin-Madison. His data, reported in Science this week, suggest that large mammals were already rare well before the purported impact.
Scraping the bottom
Williams and his colleagues searched layered lake-bottom deposits in Indiana and New York State for the spores of the fungus Sporormiella found in the dung of large plant-eating mammals such as mammoths and horses.
From a decline in the spore counts, they conclude that the megafauna population dropped steadily between 14,800 and 13,700 years ago, making them rare 800 years before any comet strike. Williams says the data rule out a sudden, impact-driven extinction.
However, geologist and impact-advocate James Kennett at the University of California, Santa Barbara, calls that "a classic case of over-interpretation" because the data comes from only a small area and not from different sites across the whole of North America.
Some anthropologists are also unhappy and with the sudden extinction theory, taking issue with claims that an impact wiped out the Clovis people.
It's true that distinctive Clovis-style artefacts disappear and sites were abandoned at the start of a dramatic cooling event which began about 13,000 years ago called the Younger Dryas. But the people didn't die, says Vance Holliday of the University of Arizona in Tucson. "An artefact style was replaced by another style. You see that all over the world." Moreover, early North Americans were highly mobile hunter-gatherers who occupied sites only briefly before moving on.
What's more, the geological layer representing the Younger Dryas is missing the sort of extraterrestrial material that was a hallmark of the impact that wiped out the dinosaurs.
Isotope geochemist Mukul Sharma of Dartmouth College in Hanover, New Hampshire, says he has been unable to find any significant amount of platinum-group elements with the distinctive isotopic signature showing that they came from space. Sharma will detail his findings at the AGU meeting.
Yet something did crash into the Pacific Ocean around the period in question. In a separate AGU paper, Sharma will report finding traces of extraterrestrial osmium on the floor of the mid-Pacific dating from between 16,000 and 8000 years ago.
Some Younger Dryas deposits do contain residues similar to those from the 1908 Tunguska explosion over Siberia, says Adrian Melott of the University of Kansas, Lawrence. He reckons the North American event was "something maybe a couple of orders of magnitude bigger than Tunguska" – but still perhaps only one-hundredth the scale of the proposed comet blast.
Harvard Professor Noel Ignatiev talks about how to end the White race 2014 09 02 There was some doubt earlier this week as to the validity of the claim in Kevin MacDonald’s article The War Against Whites.
We’ll we found something for your guys:
Not that this is the only one, far from it, this is just a small sample of the barrage of conferences and a well educated cultural marxists that have set their goals ...
Secret underground tunnels of ancient Mesopotamian cult revealed under Ani ruins 2014 09 01
For the first time in history, the academic world is paying attention to the spectacular underground world of Ani, a 5,000-year-old Armenian city located on the Turkish-Armenian border. Hurriyet Daily News reports that scientists, academics, and researchers have just met at a symposium in Kars titled ‘Underground Secrets of Ani’ to discuss the city’s underground world mentioned in ancient ...
A Government Vision Of The Future That Isn’t That Great 2014 09 01 Here’s a report by the UK Ministry of Defense, a document that they’re not hiding - it’s not classified. In fact, they WANT you to read it: the Global Strategic Trends 2045. For your convenience, they’ve even produced a handy video about their dire predictions:
They present a warning call for how things are going to be bad in the future. ...
Bad Memories Turned to Happy Ones in Mice Brains 2014 09 01 Memories are often associated with emotions, and these feelings can change through new experiences and over time. Now, using light, scientists have been able to manipulate mice brain cells and turn the animals’ fearful memories into happy ones, according to a new study.
Memories are encoded in groups of neurons that are activated together or in specific patterns, but it is ...