New research supports hypothesis that asteroid contributed to mass extinction

African evidence support Younger Dryas Impact Hypothesis
A world map that shows where similary platinum spikes have been discovered in the world. The latest discovery is at the Wonderkrater site in Limpopo Province, South Africa. Credit: Francis Thackeray/Wits University

A team of scientists from South Africa has discovered evidence partially supporting a hypothesis that Earth was struck by a meteorite or asteroid 12 800 years ago, leading to global consequences including climate change, and contributing to the extinction of many species of large animals at the time of an episode called the Younger Dryas.

The team, led by Professor Francis Thackeray of the Evolutionary Studies Institute at the University of the Witwatersrand in Johannesburg, South Africa, discovered evidence of a remarkable "platinum spike" at a site called Wonderkrater in the Limpopo Province, north of Pretoria in South Africa. Working with researcher Philip Pieterse from the University of Johannesburg and Professor Louis Scott of the University of the Free State, Thackeray discovered this evidence from a core drilled in a peat deposit, notably in a sample about 12 800 years old. This research was published in Palaeontologia Africana.

Noting that meteorites are rich in platinum, Thackeray said "Our finding at least partially supports the highly controversial Younger Dryas Impact Hypothesis (YDIH). We seriously need to explore the view that an asteroid impact somewhere on earth may have caused on a global scale, and contributed to some extent to the process of extinctions of large animals at the end of the Pleistocene, after the last ice age."

Many mammals became extinct in North America, South America and Europe at the time of the Younger Dryas. In South Africa a few extraordinary large animal species became extinct, not necessarily at exactly 12 800 years ago, but close to that period. These megafauna include a giant African buffalo, a large zebra, and a very big wildebeest.

Human populations may also have been indirectly affected at the time in question. In North America there is a dramatic termination of the stone tool technology of Clovis people. Remarkably, archaeologists in South Africa have detected an almost simultaneous termination of the Robberg stone artifact industry associated with people in some parts of the country, including the area around Boomplaas near the Cango Caves in the southern Cape, close to the town of Oudshoorn.

"Without necessarily arguing for a single causal factor on a global scale, we cautiously hint at the possibility that these technological changes, in North America and on the African subcontinent at about the same time, might have been associated indirectly with an asteroid impact with major global consequences," says Thackeray. "We cannot be certain, but a cosmic impact could have affected humans as a result of local changes in environment and the availability of food resources, associated with sudden climate change."

At Wonderkrater, the team has evidence from pollen to show that about 12 800 years ago there was temporary cooling, associated with the "Younger Dryas" drop in temperature that is well documented in the northern hemisphere, and now also in South Africa. According to some scientists, this cooling in widespread areas could at least potentially have been associated with the global dispersal of platinum-rich atmospheric dust.

A large crater 31 kilometers in diameter has been discovered in northern Greenland beneath the Hiawatha Glacier. "There is some evidence to support the view that it might possibly have been the very place where a large meteorite struck the planet earth 12 800 years ago," says Thackeray. "If this was indeed the case, there must have been global consequences."

Thackeray's team believes their discovery of a platinum spike at about 12 800 years ago at Wonderkrater is just part of the strengthening view that an asteroid or cometary impact might have occurred at that time.

This is the first evidence in Africa for a platinum spike preceding climate change. Younger Dryas spikes in platinum have also been found in Greenland, Eurasia, North America, Mexico and recently also at Pilauco in Chile. Wonderkrater is the 30th site in the world for such evidence.

"Our evidence is entirely consistent with the Younger Dryas Impact Hypothesis" says Thackeray.

The discovery in South Africa is expected to be integrated with those made in other parts of the world, recognizing that the source of the platinum at Wonderkrater could hypothetically be cosmic dust that was dispersed in the atmosphere after a meteorite impact in Greenland.

The probability of a large asteroid striking Earth in the future may seem to be low, but there are thousands of large rocks distributed primarily between Jupiter and Mars. One in particular, classified as Apophis 99942, is referred to as a "Potentially Hazardous Asteroid." It is 340 meters wide and will come exceptionally close to the Earth in 10 years' time.

"The closest encounter will take place precisely on Friday April 13, 2029," says Thackeray. "The probability of the Apophis 99942 asteroid hitting us then is only one in 100 000, but the probability of an impact may be even higher at some time in the future, as it comes close to Earth every 10 years."


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Geologic evidence supports theory that major cosmic impact event occurred approximately 12,800 years ago

More information: The Younger Dryas interval at Wonderkrater (South Africa) in the context of a platinum anomaly hdl.handle.net/10539/28129
Provided by Wits University
Citation: New research supports hypothesis that asteroid contributed to mass extinction (2019, October 2) retrieved 20 October 2019 from https://phys.org/news/2019-10-hypothesis-asteroid-contributed-mass-extinction.html
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Oct 02, 2019
The skeptics won't like this.

Oct 02, 2019
What you have is the most ridiculous published conclusions I've seen this year based on the extrapolations of the facts presented, coupled with a complete denial or lack of knowledge from the well established gradual and spread out extinction dates for the mega-fauna based on data collected from numerous excavation sites worldwide within the northern temperate zone. Let me help....What you have is an infinitesimal platinum signature from a modest meteorite event at best where the impact site is so small it can not be found to date. There is also no widespread heavy banding in the geological record like that seen from the iridium banding of the KT event, this commensurate with all the heavy carbon deposits left behind by incineration grade heat and now you are telling me this event caused a global cooling for 1000 years (Younger Dryas) because some dust got kicked up into the stratosphere. Really !!!!!! This is not the cause or precipitation of the extended Younger Dryas period....

Oct 02, 2019
Just more clickbait for the ignorant Chicken Little, as that first post proves.

Oct 03, 2019
"...impact site is so small it can not be found to date."

Unfortunately, if impactor struck thick ice-cap, primary evidence could be lacking. No crater, no 'smoking gun' ? And, as we've seen, possible secondary evidence is bitterly disputed...

IIRC, there are no convincing models for such an impact. Still, I would not wish the reality upon my global neighbours...

Oct 05, 2019
...the Mediterranean sea is the impact crater, where the Moon had split Pangaea, wiping away our ancestors investment, recharging the #dynamo, warping DNA,.. #13kya #YDB #shockdynamics #impactphysics give it a look!..
https://www.linke...ny-hood/ :-]

Oct 07, 2019
you can tell by the whacko comments
that there are always simpletons whining for simple singular speculations/dogma/theories

so they never have to make the intellectual effort to correct their own previous errors of absolutist conclusions

my guess would be theYounger
Dryas had several triggering events
that occurred close enough in Time
to run several local disasters into a temporary global catastrophe

species that were already borderline for survival
suffered the worst of natural & space debris climate changes

in addition to pressure from expanding Human predation
& especially Humans widespread use & misuse of fire

which many teetering species could not adapt to fast enough

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